commit da3883205c1ba89809836869d3561f1c7a640a5b
Author: mouseleee <543748616@qq.com>
Date:   Sun Nov 16 22:17:16 2025 +0800

    feat: opensearch客户端初始化 feat: 索引模板接口 ai: 开发准则 chore: TDD流水线脚本

diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..ab7c2bc
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,14 @@
+# OpenSearch 配置示例
+# 复制此文件为 .env 并填写实际值
+
+# OpenSearch 集群端点
+ES_ENDPOINT=
+
+# AWS 区域
+AWS_REGION=
+
+# AWS 访问密钥 ID
+AWS_ACCESS_KEY_ID=
+
+# AWS 访问密钥密文
+AWS_SECRET_ACCESS_KEY=
diff --git a/.github/instructions/CLAUDE_GUIDELINE.instructions.md b/.github/instructions/CLAUDE_GUIDELINE.instructions.md
new file mode 100644
index 0000000..2593710
--- /dev/null
+++ b/.github/instructions/CLAUDE_GUIDELINE.instructions.md
@@ -0,0 +1,23 @@
+---
+applyTo: '**'
+---
+⚙️ AGENT 执行协议
+本协议定义了 Agent 在任务执行期间必须遵守的操作指南和工作流程约束。严格遵守所有要点是不可谈判的。
+
+一、执行前强制检查
+强制审查开发准则：在启动任何开发或编码任务之前，你必须首先审查并确认遵守已经建立的开发准则（即系统 Prompt 或其他指令文件）。你所采取的任何行动都必须与这些总体规则保持一致。
+
+二、设计与清晰度
+清晰度优先：如果用户需求含糊不清、不完整，或者关键逻辑不确定，你必须暂停执行并向用户提出澄清问题，以确保完全理解后再进行后续实现。
+
+零成本抽象原则（KISS 原则）：严格遵守“如无必要，勿增实体”的原则。不要引入任何对于所需功能并非严格必要的文件、模块、抽象或依赖。
+
+三、开发工作流程（TDD）
+测试驱动开发（TDD）：你必须严格遵循测试驱动开发（TDD）流程。任何新功能或修复的实现工作，只能在相应的、失败的测试用例已编写并保存之后才能开始。
+
+四、输出与文件管理
+输出限制：禁止使用说明文档：你不得生成任何详细说明如何使用或调用所实现代码的补充文档。只应生成源代码和必要的配置文件。
+
+文件生成限制：对于任何给定的模块或逻辑单元，你至多只能生成一个主要的文档文件（例如，该模块的 README.md 或设计文件）。避免在多个文件之间冗余地生成文档。
+
+测试编译是否成功的输出文件：只是为了验证是否可以编译成功，不需要保留这些输出文件。
\ No newline at end of file
diff --git a/.github/instructions/DEV_GUIDELINE.instructions.md b/.github/instructions/DEV_GUIDELINE.instructions.md
new file mode 100644
index 0000000..cb226d3
--- /dev/null
+++ b/.github/instructions/DEV_GUIDELINE.instructions.md
@@ -0,0 +1,975 @@
+---
+applyTo: '**/*.go'
+---
+# AI Agent 开发指令
+
+本文档为 AI Agent（GitHub Copilot）提供开发本项目时的详细指令和指南。
+
+## 项目背景
+
+这是一个用于测试和实验 AWS OpenSearch Service 的 Go 项目。项目目标是创建生产级别的代码，并为未来转化为可复用的依赖库做准备。
+
+## 核心原则
+
+### 1. 代码质量要求（最高优先级）
+
+**必须遵循 Go 官方最佳实践：**
+
+- **Effective Go**: https://go.dev/doc/effective_go
+- **Go Code Review Comments**: https://github.com/golang/go/wiki/CodeReviewComments
+- **Go 标准库风格**: 参考标准库的代码风格和设计模式
+
+**具体要求：**
+
+```go
+// ✅ 正确：导出的函数必须有文档注释，以函数名开头
+// NewClient creates and initializes a new OpenSearch client with the provided configuration.
+// It returns an error if the connection cannot be established.
+func NewClient(cfg *Config) (*Client, error) {
+    // ...
+}
+
+// ❌ 错误：缺少注释或注释不以函数名开头
+func NewClient(cfg *Config) (*Client, error) {
+    // ...
+}
+```
+
+```go
+// ✅ 正确：错误处理不能忽略
+result, err := client.Search(ctx, query)
+if err != nil {
+    return nil, fmt.Errorf("search failed: %w", err)
+}
+
+// ❌ 错误：忽略错误
+result, _ := client.Search(ctx, query)
+```
+
+```go
+// ✅ 正确：使用有意义的变量名
+var maxRetryCount = 3
+var connectionTimeout = 30 * time.Second
+
+// ❌ 错误：使用无意义的缩写
+var mrc = 3
+var ct = 30 * time.Second
+```
+
+### 2. 命名规范
+
+**包名：**
+- 小写、简短、单数形式
+- 避免使用下划线或驼峰命名
+- 示例：`client`、`search`、`document`（不是 `opensearch_client`）
+
+**接口名：**
+- 单方法接口以 `-er` 结尾：`Reader`、`Writer`、`Searcher`
+- 多方法接口使用描述性名称：`IndexManager`、`DocumentService`
+
+**变量和函数名：**
+- 驼峰命名（camelCase 或 PascalCase）
+- 缩写词保持一致大写：`URL`、`HTTP`、`ID`、`JSON`（不是 `Url`、`Http`、`Id`、`Json`）
+- 示例：`clientID`、`httpClient`、`parseURL`
+
+**常量：**
+```go
+// ✅ 正确：使用驼峰命名
+const DefaultTimeout = 30 * time.Second
+const MaxRetries = 3
+
+// 或者使用全大写（枚举类型）
+const (
+    StatusPending  = "PENDING"
+    StatusComplete = "COMPLETE"
+)
+```
+
+### 3. 错误处理规范
+
+**基本错误处理：**
+
+```go
+// ✅ 正确：包装错误，提供上下文信息
+if err != nil {
+    return fmt.Errorf("failed to create index %q: %w", indexName, err)
+}
+
+// ✅ 正确：自定义错误类型（当需要时）
+var ErrIndexNotFound = errors.New("index not found")
+var ErrInvalidQuery = errors.New("invalid query syntax")
+
+// ✅ 正确：错误检查使用 errors.Is 或 errors.As
+if errors.Is(err, ErrIndexNotFound) {
+    // 处理索引不存在的情况
+}
+
+// ❌ 错误：吞掉错误信息
+if err != nil {
+    return errors.New("something went wrong")
+}
+```
+
+**Defer 中的错误处理：**
+
+对于 `defer` 语句中的 Close() 等清理操作，**不能**完全忽略错误：
+
+```go
+// ✅ 正确：检查并记录 Close 错误
+defer func() {
+    if closeErr := res.Body.Close(); closeErr != nil {
+        fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+    }
+}()
+
+// ❌ 错误：完全忽略错误（虽然能通过 linter，但不是最佳实践）
+defer func() { _ = res.Body.Close() }()
+
+// ❌ 错误：不处理错误（errcheck 警告）
+defer res.Body.Close()
+```
+
+**原因说明：**
+- HTTP Response Body 的 Close() 错误虽然通常不影响业务逻辑（数据已读取）
+- 但完全忽略错误不符合 Go 最佳实践
+- 检查并记录到 stderr 便于调试和监控
+- 这种方式既满足 linter 要求，又提供诊断信息
+```
+
+### 4. 注释规范
+
+```go
+// ✅ 正确：包注释（在 package 语句之前）
+// Package client provides a high-level interface for interacting with AWS OpenSearch Service.
+// It handles connection management, authentication, and request signing.
+package client
+
+// ✅ 正确：导出类型的注释
+// Client represents an OpenSearch client that manages connections and operations.
+type Client struct {
+    // ...
+}
+
+// ✅ 正确：导出方法的注释
+// Search executes a search query against the specified index.
+// It returns the search results or an error if the operation fails.
+func (c *Client) Search(ctx context.Context, indexName string, query Query) (*SearchResult, error) {
+    // ...
+}
+
+// ✅ 正确：复杂逻辑的内部注释
+func processResults(data []byte) error {
+    // Parse JSON response
+    var resp Response
+    if err := json.Unmarshal(data, &resp); err != nil {
+        return err
+    }
+    
+    // Validate response structure
+    if resp.Total == 0 {
+        return ErrNoResults
+    }
+    
+    // Transform results
+    // ...
+}
+```
+
+### 5. 代码结构规范
+
+**文件组织：**
+```go
+// 1. 包声明和包注释
+// Package client provides...
+package client
+
+// 2. 导入语句（分组：标准库、第三方库、本地包）
+import (
+    "context"
+    "fmt"
+    "time"
+    
+    "github.com/opensearch-project/opensearch-go/v2"
+    
+    "es-demo/config"
+    "es-demo/models"
+)
+
+// 3. 常量
+const (
+    DefaultTimeout = 30 * time.Second
+)
+
+// 4. 变量
+var (
+    ErrInvalidConfig = errors.New("invalid configuration")
+)
+
+// 5. 类型定义
+type Client struct {
+    // ...
+}
+
+// 6. 构造函数
+func NewClient(cfg *Config) (*Client, error) {
+    // ...
+}
+
+// 7. 方法（接收者方法）
+func (c *Client) Connect(ctx context.Context) error {
+    // ...
+}
+
+// 8. 其他函数
+func validateConfig(cfg *Config) error {
+    // ...
+}
+```
+
+**接口设计：**
+```go
+// ✅ 正确：接口定义在使用方，而非实现方
+// 在 operations/search 包中定义
+type DocumentStore interface {
+    GetDocument(ctx context.Context, id string) (*Document, error)
+    PutDocument(ctx context.Context, doc *Document) error
+}
+
+// ✅ 正确：保持接口小而专注
+type Searcher interface {
+    Search(ctx context.Context, query Query) (*Result, error)
+}
+
+type Indexer interface {
+    CreateIndex(ctx context.Context, name string, settings map[string]any) error
+    DeleteIndex(ctx context.Context, name string) error
+}
+```
+
+### 6. 测试规范
+
+**文件命名：**
+- 测试文件：`client_test.go`（对应 `client.go`）
+- 测试函数：`TestNewClient`、`TestClient_Search`
+
+**测试结构：**
+```go
+func TestNewClient(t *testing.T) {
+    // 使用表驱动测试
+    tests := []struct {
+        name    string
+        config  *Config
+        want    bool  // 期望成功/失败
+        wantErr error
+    }{
+        {
+            name: "valid config",
+            config: &Config{
+                Endpoint: "https://example.com",
+            },
+            want:    true,
+            wantErr: nil,
+        },
+        {
+            name:    "nil config",
+            config:  nil,
+            want:    false,
+            wantErr: ErrInvalidConfig,
+        },
+    }
+    
+    for _, tt := range tests {
+        t.Run(tt.name, func(t *testing.T) {
+            got, err := NewClient(tt.config)
+            if !errors.Is(err, tt.wantErr) {
+                t.Errorf("NewClient() error = %v, wantErr %v", err, tt.wantErr)
+                return
+            }
+            if (got != nil) != tt.want {
+                t.Errorf("NewClient() got = %v, want %v", got != nil, tt.want)
+            }
+        })
+    }
+}
+
+// 集成测试（需要真实环境）
+func TestClient_Search_Integration(t *testing.T) {
+    if testing.Short() {
+        t.Skip("skipping integration test in short mode")
+    }
+    
+    // 测试逻辑...
+}
+```
+
+**辅助函数：**
+```go
+// 测试辅助函数以小写字母开头（不导出）
+func setupTestClient(t *testing.T) *Client {
+    t.Helper()
+    
+    cfg := &Config{
+        Endpoint: "http://localhost:9200",
+    }
+    client, err := NewClient(cfg)
+    if err != nil {
+        t.Fatalf("failed to create test client: %v", err)
+    }
+    return client
+}
+
+func cleanupTestIndex(t *testing.T, client *Client, indexName string) {
+    t.Helper()
+    
+    if err := client.DeleteIndex(context.Background(), indexName); err != nil {
+        t.Logf("cleanup failed: %v", err)
+    }
+}
+```
+
+## 项目阶段考虑
+
+### 当前阶段（实验期）
+
+**允许的简化：**
+
+1. **配置管理**：可以使用全局变量
+```go
+// config/config.go
+package config
+
+var (
+    // Global configuration (acceptable in experimental phase)
+    Endpoint  string
+    AccessKey string
+    SecretKey string
+    Region    string
+)
+
+func Init() {
+    // Simple initialization from environment variables
+    Endpoint = os.Getenv("ES_ENDPOINT")
+    AccessKey = os.Getenv("AWS_ACCESS_KEY_ID")
+    SecretKey = os.Getenv("AWS_SECRET_ACCESS_KEY")
+    Region = os.Getenv("AWS_REGION")
+}
+```
+
+2. **日志系统**：基础的 log 包使用
+```go
+// utils/logger.go
+package utils
+
+import "log"
+
+var (
+    // Global logger (acceptable in experimental phase)
+    Logger = log.New(os.Stdout, "[ES-Demo] ", log.LstdFlags)
+)
+
+func Info(msg string, args ...any) {
+    Logger.Printf("INFO: "+msg, args...)
+}
+
+func Error(msg string, args ...any) {
+    Logger.Printf("ERROR: "+msg, args...)
+}
+```
+
+**但必须保持：**
+- 代码的可读性和可维护性
+- 清晰的职责划分
+- 完整的错误处理
+- 充分的注释
+
+## 代码质量检查
+
+### 使用 Linter 进行自动化检查
+
+本项目使用 `golangci-lint` 进行代码质量检查。在生成或修改代码后，**必须**确保代码通过 linter 检查。
+
+**配置文件：** `.golangci.yml`
+
+**运行 Linter：**
+```bash
+# 检查所有代码
+golangci-lint run ./...
+
+# 自动修复部分问题
+golangci-lint run --fix ./...
+```
+
+**处理 Linter 输出：**
+1. 认真阅读每一条 linter 警告和错误
+2. 理解问题的根本原因
+3. 按照 Go 最佳实践修复问题
+4. 不要通过禁用 linter 规则来"修复"问题（除非有充分理由）
+5. 如需禁用某个规则，必须在配置文件中注释说明原因
+
+**常见 Linter 问题及解决方案：**
+
+- `errcheck`: 错误未处理 → 添加错误处理逻辑
+- `gofmt`: 格式不正确 → 运行 `go fmt ./...`
+- `govet`: 可疑构造 → 重构代码
+- `ineffassign`: 无效赋值 → 移除或修正赋值
+- `staticcheck`: 静态分析问题 → 按建议修改
+
+**集成到开发流程：**
+- 在提交代码前，运行测试流水线（包含 linter 检查）
+- 确保 linter 零警告、零错误
+- CI/CD 流水线应包含 linter 检查步骤
+
+## 常见模式和示例
+
+### 客户端初始化模式
+```go
+// Config holds the configuration for the OpenSearch client.
+type Config struct {
+    Endpoint  string
+    Region    string
+    AccessKey string
+    SecretKey string
+    Timeout   time.Duration
+}
+
+// Client represents an OpenSearch client.
+type Client struct {
+    config *Config
+    client *opensearch.Client
+}
+
+// NewClient creates a new OpenSearch client with the given configuration.
+func NewClient(cfg *Config) (*Client, error) {
+    if cfg == nil {
+        return nil, fmt.Errorf("config cannot be nil")
+    }
+    
+    if err := validateConfig(cfg); err != nil {
+        return nil, fmt.Errorf("invalid config: %w", err)
+    }
+    
+    // Initialize OpenSearch client
+    osClient, err := opensearch.NewClient(opensearch.Config{
+        Addresses: []string{cfg.Endpoint},
+        // ... other settings
+    })
+    if err != nil {
+        return nil, fmt.Errorf("failed to create opensearch client: %w", err)
+    }
+    
+    return &Client{
+        config: cfg,
+        client: osClient,
+    }, nil
+}
+
+func validateConfig(cfg *Config) error {
+    if cfg.Endpoint == "" {
+        return errors.New("endpoint is required")
+    }
+    if cfg.Region == "" {
+        return errors.New("region is required")
+    }
+    return nil
+}
+```
+
+### 操作方法模式
+```go
+// SearchRequest represents a search query request.
+type SearchRequest struct {
+    Index string
+    Query map[string]any
+    Size  int
+    From  int
+}
+
+// SearchResult represents the response from a search operation.
+type SearchResult struct {
+    Hits  []Document
+    Total int64
+    Took  int64
+}
+
+// Search executes a search query against the specified index.
+func (c *Client) Search(ctx context.Context, req *SearchRequest) (*SearchResult, error) {
+    if req == nil {
+        return nil, errors.New("search request cannot be nil")
+    }
+    
+    if req.Index == "" {
+        return nil, errors.New("index name is required")
+    }
+    
+    // Build and execute search
+    // ...
+    
+    return result, nil
+}
+```
+
+### Context 使用模式
+```go
+// 所有可能阻塞或需要超时控制的操作都应接受 context
+func (c *Client) CreateIndex(ctx context.Context, name string, settings map[string]any) error {
+    // 使用 context 控制超时
+    req, err := http.NewRequestWithContext(ctx, "PUT", c.buildURL(name), body)
+    if err != nil {
+        return fmt.Errorf("failed to create request: %w", err)
+    }
+    
+    // ...
+}
+
+// 调用示例
+ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+defer cancel()
+
+err := client.CreateIndex(ctx, "my-index", settings)
+```
+
+## 版本和依赖管理
+
+**依赖选择原则：**
+1. 优先使用最新稳定版本
+2. 使用官方推荐的库（如 opensearch-go）
+3. 定期更新依赖（使用 `go get -u` 和 `go mod tidy`）
+
+**更新依赖时检查：**
+```bash
+# 查看可用更新
+go list -u -m all
+
+# 更新特定依赖
+go get -u github.com/opensearch-project/opensearch-go/v2@latest
+
+# 整理依赖
+go mod tidy
+```
+
+## 测试流水线
+
+### 流水线脚本要求
+
+项目**必须**包含自动化测试流水线脚本，用于执行完整的代码质量检查流程。
+
+**脚本命名规范：**
+- Windows (PowerShell): `test.ps1`
+- Linux/Mac (Bash): `test.sh`
+
+**流水线阶段（按顺序执行）：**
+
+1. **Linting** - 代码质量检查
+   ```bash
+   golangci-lint run ./...
+   ```
+
+2. **Build** - 编译验证
+   ```bash
+   # 编译但不保留二进制文件
+   go build -o /dev/null .      # Linux/Mac
+   go build -o NUL .            # Windows
+   ```
+
+3. **Test** - 运行测试
+   ```bash
+   go test -v -short -coverprofile=coverage.out ./...
+   ```
+
+4. **Cleanup** - 清理构建产物
+   ```bash
+   # 删除编译输出、覆盖率文件等
+   rm -f *.exe *.test coverage.out coverage.html
+   ```
+
+### 流水线脚本检查
+
+**在最终测试前，AI Agent 必须检查：**
+
+1. 当前平台是否存在对应的流水线脚本
+2. 如果不存在但有其他平台的脚本，则根据当前平台创建对应版本
+
+**平台检测和脚本生成逻辑：**
+
+```go
+// 伪代码示例
+if platform == "Windows" {
+    if !exists("test.ps1") {
+        if exists("test.sh") {
+            // 将 test.sh 翻译为 test.ps1
+            createWindowsScript()
+        } else {
+            // 创建新的 Windows 脚本
+            createDefaultWindowsScript()
+        }
+    }
+} else if platform == "Linux" || platform == "Mac" {
+    if !exists("test.sh") {
+        if exists("test.ps1") {
+            // 将 test.ps1 翻译为 test.sh
+            createUnixScript()
+        } else {
+            // 创建新的 Unix 脚本
+            createDefaultUnixScript()
+        }
+    }
+}
+```
+
+### PowerShell 脚本示例 (test.ps1)
+
+```powershell
+#!/usr/bin/env pwsh
+# 测试流水线脚本 - Windows PowerShell
+
+param(
+    [switch]$SkipLint,
+    [switch]$SkipBuild,
+    [switch]$SkipTest,
+    [switch]$Verbose
+)
+
+$ErrorActionPreference = "Stop"
+
+# 1. Linting
+if (-not $SkipLint) {
+    Write-Host "=== Linting ===" -ForegroundColor Yellow
+    golangci-lint run ./...
+    if ($LASTEXITCODE -ne 0) { exit 1 }
+}
+
+# 2. Build
+if (-not $SkipBuild) {
+    Write-Host "=== Build ===" -ForegroundColor Yellow
+    go build -o NUL .
+    if ($LASTEXITCODE -ne 0) { exit 1 }
+}
+
+# 3. Test
+if (-not $SkipTest) {
+    Write-Host "=== Test ===" -ForegroundColor Yellow
+    go test -v -short -coverprofile=coverage.out ./...
+    if ($LASTEXITCODE -ne 0) { exit 1 }
+    go tool cover -func=coverage.out | Select-String "total:"
+}
+
+# 4. Cleanup
+Write-Host "=== Cleanup ===" -ForegroundColor Yellow
+Remove-Item -Path "*.exe","*.test","coverage.out","coverage.html" -ErrorAction SilentlyContinue
+
+Write-Host "✅ Pipeline PASSED" -ForegroundColor Green
+```
+
+### Bash 脚本示例 (test.sh)
+
+```bash
+#!/usr/bin/env bash
+# 测试流水线脚本 - Linux/Mac Bash
+
+set -euo pipefail
+
+SKIP_LINT=false
+SKIP_BUILD=false
+SKIP_TEST=false
+VERBOSE=false
+
+# 解析参数
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        --skip-lint) SKIP_LINT=true; shift ;;
+        --skip-build) SKIP_BUILD=true; shift ;;
+        --skip-test) SKIP_TEST=true; shift ;;
+        --verbose) VERBOSE=true; shift ;;
+        *) echo "Unknown option: $1"; exit 1 ;;
+    esac
+done
+
+# 1. Linting
+if [ "$SKIP_LINT" = false ]; then
+    echo "=== Linting ==="
+    golangci-lint run ./...
+fi
+
+# 2. Build
+if [ "$SKIP_BUILD" = false ]; then
+    echo "=== Build ==="
+    go build -o /dev/null .
+fi
+
+# 3. Test
+if [ "$SKIP_TEST" = false ]; then
+    echo "=== Test ==="
+    go test -v -short -race -coverprofile=coverage.out ./...
+    go tool cover -func=coverage.out | grep total:
+fi
+
+# 4. Cleanup
+echo "=== Cleanup ==="
+rm -f *.exe *.test coverage.out coverage.html
+
+echo "✅ Pipeline PASSED"
+```
+
+### 使用流水线
+
+**日常开发：**
+```bash
+# Windows
+powershell -ExecutionPolicy Bypass -File .\test.ps1
+
+# Linux/Mac
+chmod +x test.sh
+./test.sh
+```
+
+**跳过特定阶段：**
+```bash
+# Windows - 跳过 linting
+powershell -ExecutionPolicy Bypass -File .\test.ps1 -SkipLint
+
+# Linux/Mac - 跳过 build
+./test.sh --skip-build
+```
+
+**CI/CD 集成：**
+```yaml
+# GitHub Actions 示例
+- name: Run test pipeline
+  run: |
+    if [ "$RUNNER_OS" == "Windows" ]; then
+      pwsh -File test.ps1
+    else
+      ./test.sh
+    fi
+```
+
+### 流水线最佳实践
+
+1. **构建产物管理：**
+   - 编译时不保留二进制文件（输出到 `/dev/null` 或 `NUL`）
+   - 测试后自动清理所有临时文件
+   - 在 `.gitignore` 中排除所有构建产物
+
+2. **失败快速原则：**
+   - 任何阶段失败立即终止流水线
+   - 返回非零退出码
+   - 提供清晰的错误信息
+
+3. **可配置性：**
+   - 提供跳过特定阶段的选项
+   - 支持详细输出模式
+   - 允许自定义超时设置
+
+4. **跨平台一致性：**
+   - 确保 Windows 和 Linux/Mac 脚本功能一致
+   - 使用等效的命令和选项
+   - 测试结果应该相同
+
+## 文档要求
+
+**代码文档：**
+- 所有导出的标识符必须有文档注释
+- 复杂的内部逻辑添加解释性注释
+- 注释应解释"为什么"而不仅仅是"是什么"
+
+**README 维护：**
+- 添加新功能时更新功能列表
+- 添加示例代码展示用法
+- 更新配置说明
+
+**示例代码：**
+- 在 `examples/` 目录提供可运行的示例
+- 示例代码必须可编译和运行
+- 包含必要的错误处理
+
+## AI Agent 工作流程（TDD 原则）
+
+当收到开发任务时，**必须严格遵循 TDD（测试驱动开发）流程**：
+
+### 1. Red（红灯阶段）- 编写失败的测试
+
+**理解需求：**
+- 明确要实现的功能和预期行为
+- 确定输入、输出和边界条件
+- 识别可能的错误场景
+
+**设计 API：**
+- 定义函数签名和类型
+- 设计清晰的接口
+- 确定错误返回值
+
+**编写测试（先于实现）：**
+```go
+// 示例：先写测试
+func TestNewClient(t *testing.T) {
+    tests := []struct {
+        name    string
+        config  *Config
+        wantErr error
+    }{
+        {
+            name: "valid config",
+            config: &Config{Endpoint: "https://example.com"},
+            wantErr: nil,
+        },
+        {
+            name:    "nil config",
+            config:  nil,
+            wantErr: ErrInvalidConfig,
+        },
+    }
+    
+    for _, tt := range tests {
+        t.Run(tt.name, func(t *testing.T) {
+            got, err := NewClient(tt.config)
+            if !errors.Is(err, tt.wantErr) {
+                t.Errorf("NewClient() error = %v, wantErr %v", err, tt.wantErr)
+            }
+        })
+    }
+}
+```
+
+**验证测试失败：**
+- 运行测试，确认测试失败（因为功能还未实现）
+- 确保测试失败的原因是正确的
+
+### 2. Green（绿灯阶段）- 编写最小实现
+
+**实现功能：**
+- 编写最少的代码让测试通过
+- 遵循本文档的所有规范
+- 添加完整的文档注释
+- 实现完整的错误处理
+
+```go
+// 示例：实现功能
+func NewClient(cfg *Config) (*Client, error) {
+    if cfg == nil {
+        return nil, ErrInvalidConfig
+    }
+    
+    // 最小实现
+    return &Client{config: cfg}, nil
+}
+```
+
+**运行测试：**
+- 确保所有测试通过
+- 检查测试覆盖率
+
+### 3. Refactor（重构阶段）- 优化代码
+
+**代码重构：**
+- 消除重复代码
+- 改进命名和结构
+- 优化性能（如需要）
+- 确保代码可读性
+
+**运行 Linter：**
+```bash
+golangci-lint run ./...
+```
+
+**修复所有 Linter 问题**
+
+**再次运行测试：**
+- 确保重构后测试仍然通过
+- 验证代码行为未改变
+
+### 4. 验证和文档
+
+**运行测试流水线：**
+```bash
+# Windows
+powershell -ExecutionPolicy Bypass -File .\test.ps1
+
+# Linux/Mac
+./test.sh
+```
+
+**更新文档：**
+- 更新模块 README（如需要）
+- 更新项目 README（如需要）
+- 添加使用示例（如需要）
+
+### TDD 循环总结
+
+```
+┌─────────────────────────────────────┐
+│  1. 编写失败的测试 (Red)            │
+│     - 定义预期行为                   │
+│     - 验证测试确实失败               │
+└──────────────┬──────────────────────┘
+               ↓
+┌─────────────────────────────────────┐
+│  2. 编写最小实现 (Green)             │
+│     - 让测试通过                     │
+│     - 不过度设计                     │
+└──────────────┬──────────────────────┘
+               ↓
+┌─────────────────────────────────────┐
+│  3. 重构优化 (Refactor)              │
+│     - 改进代码质量                   │
+│     - 运行 Linter                    │
+│     - 确保测试仍然通过               │
+└──────────────┬──────────────────────┘
+               ↓
+         ┌─────────┐
+         │ 下一功能 │
+         └─────────┘
+```
+
+**重要提醒：**
+- ❌ 不要先写实现再补测试
+- ✅ 必须先写测试，然后写实现
+- ✅ 每次只关注一个小功能
+- ✅ 频繁运行测试，保持快速反馈
+
+## 特殊指令
+
+### 生成新模块时
+1. 创建包目录和主文件
+2. 创建对应的测试文件
+3. 在 README 中更新项目结构
+4. 在功能列表中标记进度
+
+### 重构代码时
+1. 确保向后兼容（除非明确要求破坏性变更）
+2. 更新所有相关测试
+3. 更新文档和注释
+4. 运行完整测试套件
+
+### 修复 Bug 时
+1. 先编写复现 bug 的测试
+2. 修复代码
+3. 确保测试通过
+4. 添加注释说明修复内容
+
+## 禁止事项
+
+**绝对不允许：**
+- ❌ 忽略错误（使用 `_` 丢弃错误）
+- ❌ 导出的标识符没有注释
+- ❌ 使用 `panic` 处理常规错误（除非确实是不可恢复的错误）
+- ❌ 在库代码中使用 `os.Exit`
+- ❌ 硬编码配置值（应使用配置文件或环境变量）
+- ❌ 使用全局可变状态（除了当前阶段允许的配置和日志）
+
+**应当避免：**
+- ⚠️ 过长的函数（超过 50 行考虑拆分）
+- ⚠️ 过深的嵌套（超过 3 层考虑重构）
+- ⚠️ 重复代码（提取为函数）
+- ⚠️ 神秘的数字和字符串（使用命名常量）
+
+## 参考资源
+
+- [Effective Go](https://go.dev/doc/effective_go)
+- [Go Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments)
+- [Go 标准库文档](https://pkg.go.dev/std)
+- [OpenSearch Go Client](https://github.com/opensearch-project/opensearch-go)
+- [AWS SDK for Go v2](https://aws.github.io/aws-sdk-go-v2/)
+
+---
+
+**总结**: 作为 AI Agent，你的目标是生成生产级别的 Go 代码，遵循所有最佳实践，为将来转化为可复用库打下坚实基础。当有疑问时，参考 Go 标准库的实现方式。
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..81354a6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,37 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool
+*.out
+coverage
+coverage.out
+coverage.html
+
+# Dependency directories
+vendor/
+
+# Go workspace file
+go.work
+
+# Environment variables
+.env
+.env.local
+.env.test
+
+# IDE specific files
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS specific files
+.DS_Store
+Thumbs.db
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 0000000..8bb2017
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,67 @@
+# golangci-lint 配置文件
+# 详细文档: https://golangci-lint.run/usage/configuration/
+
+run:
+  timeout: 5m
+  tests: true
+  modules-download-mode: readonly
+
+output:
+  formats:
+    - format: colored-line-number
+  print-issued-lines: true
+  print-linter-name: true
+  sort-results: true
+
+linters:
+  enable:
+    # 默认启用的 linters
+    - gosimple      # 简化代码
+    - ineffassign   # 检查无效赋值
+    - staticcheck   # 静态检查
+    - unused        # 检查未使用的代码
+    
+    # 额外启用的 linters
+    - gofmt         # 检查格式化
+    - goimports     # 检查导入顺序
+    - misspell      # 检查拼写错误
+    - gosec         # 安全检查
+    - unconvert     # 检查不必要的类型转换
+    - gocyclo       # 检查代码复杂度
+    - goconst       # 检查可以提取为常量的字符串
+    - whitespace    # 检查空白符
+
+linters-settings:
+  gocyclo:
+    min-complexity: 15
+      
+  gosec:
+    excludes:
+      - G404  # 允许使用 math/rand
+      
+  gofmt:
+    simplify: true
+    
+  goimports:
+    local-prefixes: es-demo
+
+issues:
+  exclude-dirs:
+    - vendor
+  exclude-use-default: false
+  max-issues-per-linter: 0
+  max-same-issues: 0
+  
+  exclude-rules:
+    # 测试文件中允许一些宽松的规则
+    - path: _test\.go
+      linters:
+        - errcheck
+        - gosec
+        - gocyclo
+        - goconst
+        
+    # 允许在 main 包中使用 fmt.Printf
+    - path: main\.go
+      linters:
+        - forbidigo
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1c67266
--- /dev/null
+++ b/README.md
@@ -0,0 +1,256 @@
+# ES-Demo
+
+OpenSearch/Elasticsearch 客户端实验项目，用于测试和验证 AWS OpenSearch Service 的各种功能和接口。
+
+## 项目概述
+
+这是一个用于实验 AWS OpenSearch Service 的 Go 项目。项目的主要目标是：
+
+- 测试 OpenSearch 客户端的各种接口和功能
+- 实现生产级别的代码质量
+- 保持代码结构清晰、模块化
+- 完备的测试覆盖
+- 为未来转化为可复用的依赖库做准备
+
+## 项目特点
+
+- **生产级代码质量**：所有代码遵循 Go 官方最佳实践
+- **模块化设计**：清晰的目录结构和职责划分
+- **AI 辅助开发**：大部分代码由 AI 辅助生成，配合详细的指令文件
+- **测试完备**：包含单元测试和集成测试
+- **最新依赖**：使用最新版本的依赖库（除非有特殊需求）
+
+## 技术栈
+
+- **语言**: Go 1.25.3
+- **OpenSearch 客户端**: opensearch-go/v2 v2.3.0
+- **AWS SDK**: aws-sdk-go-v2 (config, aws/signer/v4)
+- **环境变量**: godotenv v1.5.1
+- **代码质量**: golangci-lint v1.64.8
+- **测试框架**: Go 标准库 testing
+
+## 项目结构
+
+```text
+es-demo/
+├── README.md                 # 项目说明文档
+├── .env.example              # 环境变量配置示例
+├── .gitignore                # Git 忽略文件配置
+├── .golangci.yml             # golangci-lint 配置
+├── test.ps1                  # 测试流水线脚本（Windows）
+├── go.mod                    # Go 模块依赖
+├── go.sum                    # 依赖校验和
+├── main.go                   # 程序入口
+├── .github/
+│   └── instructions/         # AI Agent 开发指令
+│       ├── CLAUDE_GUIDELINE.instructions.md
+│       └── DEV_GUIDELINE.instructions.md
+├── config/                   # 配置相关
+│   ├── config.go             # 全局配置，支持 .env 文件加载
+│   └── config_test.go        # 配置测试（100% 覆盖率）
+├── client/                   # OpenSearch 客户端封装
+│   ├── client.go             # 客户端连接管理和 AWS 认证
+│   └── client_test.go        # 客户端测试
+└── operations/               # 业务操作实现
+    ├── cluster/              # 集群级别运维操作
+    │   ├── cluster.go        # 集群信息查询
+    │   └── cluster_test.go   # 集群操作测试
+    └── index/                # 索引级别业务操作
+        ├── template.go       # 索引模板管理（CRUD）
+        └── template_test.go  # 模板操作测试
+```
+
+## 开发原则
+
+### 代码质量要求
+
+1. **遵循 Go 官方最佳实践**
+   - 使用 `gofmt` 格式化代码
+   - 遵循 [Effective Go](https://go.dev/doc/effective_go) 指南
+   - 遵循 [Go Code Review Comments](https://github.com/golang/go/wiki/CodeReviewComments)
+   - 使用 `go vet` 进行静态检查
+   - 使用 `golangci-lint` 进行代码检查
+
+2. **命名规范**
+   - 包名：简短、小写、单数形式
+   - 接口名：单个方法接口以 `-er` 结尾
+   - 变量名：驼峰命名，缩写词全大写（如 `URL`、`ID`）
+   - 常量：驼峰命名或全大写下划线分隔
+
+3. **错误处理**
+   - 所有错误必须处理
+   - 使用有意义的错误信息
+   - 适当时使用 `errors.Is()` 和 `errors.As()`
+   - 可考虑使用 `fmt.Errorf()` 包装错误
+
+4. **注释规范**
+   - 所有导出的类型、函数必须有注释
+   - 注释以类型或函数名开头
+   - 包注释放在 `package` 语句之前
+
+### 非功能需求（起步阶段）
+
+由于项目处于实验阶段，以下方面采用简化实现：
+
+- **配置管理**：使用全局变量，简单的配置结构
+- **日志系统**：基础的日志输出，可使用全局 logger
+- **错误处理**：基本的错误返回和处理，暂不需要复杂的错误链
+- **性能优化**：功能优先，性能问题后续优化
+
+这些简化不影响代码的可读性和可维护性，为后续改进预留空间。
+
+## 功能模块
+
+### 已完成功能
+
+#### 客户端连接 (client/)
+
+- [x] OpenSearch 客户端初始化和连接管理
+- [x] AWS v4 签名认证
+- [x] 配置验证和错误处理
+- [x] 支持 .env 文件配置加载
+
+#### 集群运维操作 (operations/cluster/)
+
+- [x] 获取集群信息（GetInfo）
+  - 集群名称、版本、UUID
+  - 节点数、分片数统计
+
+#### 索引业务操作 (operations/index/)
+
+- [x] 索引模板管理（Index Templates）
+  - PutTemplate: 创建/更新索引模板
+  - GetTemplate: 获取指定模板配置
+  - DeleteTemplate: 删除索引模板
+  - ListTemplates: 列出所有模板
+  - 模板配置验证
+
+### 待实现功能
+
+以下功能将根据实际需求逐步实现：
+
+- [ ] 索引管理（创建、删除、更新索引）
+- [ ] 文档操作（CRUD）
+- [ ] 搜索功能（基础查询、复杂查询）
+- [ ] 聚合查询
+- [ ] 批量操作
+- [ ] 性能测试工具
+
+## 快速开始
+
+### 环境要求
+
+- Go 1.25.3 或更高版本
+- AWS 账号和 OpenSearch Service 实例
+- AWS 访问凭证（Access Key ID 和 Secret Access Key）
+
+### 安装依赖
+
+```bash
+go mod download
+```
+
+### 配置
+
+[配置说明待补充]
+
+### 运行
+
+```bash
+go run main.go
+```
+
+### 测试
+
+#### 测试流水线（推荐）
+
+使用自动化测试流水线，包含 Linting、Build、Test 和 Cleanup 四个阶段：
+
+```powershell
+# Windows PowerShell
+powershell -ExecutionPolicy Bypass -File .\test.ps1
+
+# 跳过特定阶段
+powershell -ExecutionPolicy Bypass -File .\test.ps1 -SkipLint
+powershell -ExecutionPolicy Bypass -File .\test.ps1 -SkipBuild
+```
+
+#### 手动测试
+
+```bash
+# 代码质量检查
+golangci-lint run ./...
+
+# 编译检查
+go build -o NUL .
+
+# 运行所有测试（跳过集成测试）
+go test -v -short ./...
+
+# 运行测试并显示覆盖率
+go test -v -short -coverprofile=coverage.out ./...
+go tool cover -func=coverage.out
+
+# 生成 HTML 覆盖率报告
+go tool cover -html=coverage.out -o coverage.html
+```
+
+**注意**: 使用 `-short` 标志跳过需要真实 OpenSearch 实例的集成测试。
+
+## AI 辅助开发
+
+本项目大量使用 AI 辅助开发，遵循严格的 TDD（测试驱动开发）流程。详细的开发指令请参考：
+
+- [开发准则](./.github/instructions/DEV_GUIDELINE.instructions.md) - Go 最佳实践、TDD 流程、测试流水线要求
+- [Agent 执行协议](./.github/instructions/CLAUDE_GUIDELINE.instructions.md) - Agent 工作流程和执行约束
+
+## 开发路线图
+
+### 第一阶段：基础设施（已完成）
+
+- [x] 项目初始化
+- [x] 基础项目结构（Client + Operations 架构）
+- [x] OpenSearch 客户端封装（连接管理、AWS 认证）
+- [x] 基本测试框架（单元测试、集成测试分离）
+- [x] 测试流水线自动化（Lint → Build → Test → Cleanup）
+- [x] 代码质量保障（golangci-lint 集成）
+
+### 第二阶段：核心功能（进行中）
+
+- [x] 集群运维操作（GetInfo）
+- [x] 索引模板管理（CRUD）
+- [ ] 索引管理功能（创建、删除、更新索引）
+- [ ] 文档 CRUD 操作
+- [ ] 基础搜索功能
+- [ ] 完善测试覆盖
+
+### 第三阶段：高级功能
+
+- [ ] 聚合查询
+- [ ] 批量操作优化
+- [ ] 性能测试工具
+- [ ] 错误处理优化
+- [ ] 重试和容错机制
+
+### 第四阶段：库化准备
+
+- [ ] API 设计优化
+- [ ] 完整文档
+- [ ] 示例代码
+- [ ] 发布为可复用库
+
+## 贡献指南
+
+由于本项目主要用于个人实验，暂不接受外部贡献。但欢迎提出建议和问题。
+
+## 许可证
+
+[待定]
+
+## 联系方式
+
+[待补充]
+
+---
+
+**注意**: 本项目处于积极开发中，API 可能会发生变化。
diff --git a/client/client.go b/client/client.go
new file mode 100644
index 0000000..869f025
--- /dev/null
+++ b/client/client.go
@@ -0,0 +1,135 @@
+// Package client provides a high-level interface for interacting with AWS OpenSearch Service.
+// It handles connection management, authentication, and request signing.
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/opensearch-project/opensearch-go/v2"
+	requestsigner "github.com/opensearch-project/opensearch-go/v2/signer/awsv2"
+)
+
+var (
+	// ErrInvalidConfig is returned when the client configuration is invalid.
+	ErrInvalidConfig = errors.New("invalid configuration")
+
+	// ErrRequestFailed is returned when a request to OpenSearch fails.
+	ErrRequestFailed = errors.New("request failed")
+)
+
+const (
+	// DefaultTimeout is the default timeout for requests.
+	DefaultTimeout = 30 * time.Second
+)
+
+// Config holds the configuration for the OpenSearch client.
+type Config struct {
+	// Endpoint is the OpenSearch cluster endpoint URL.
+	Endpoint string
+
+	// Region is the AWS region where the OpenSearch cluster is located.
+	Region string
+
+	// AccessKey is the AWS access key ID for authentication.
+	AccessKey string
+
+	// SecretKey is the AWS secret access key for authentication.
+	SecretKey string
+
+	// Timeout is the request timeout duration. Defaults to DefaultTimeout if not set.
+	Timeout time.Duration
+}
+
+// Client represents an OpenSearch client that manages connections.
+type Client struct {
+	config *Config
+	client *opensearch.Client
+	signer *v4.Signer
+}
+
+// NewClient creates a new OpenSearch client with the given configuration.
+// It returns an error if the configuration is invalid or if the client cannot be initialized.
+func NewClient(cfg *Config) (*Client, error) {
+	if cfg == nil {
+		return nil, fmt.Errorf("%w: config cannot be nil", ErrInvalidConfig)
+	}
+
+	if err := validateConfig(cfg); err != nil {
+		return nil, fmt.Errorf("%w: %v", ErrInvalidConfig, err)
+	}
+
+	// TODO: Use cfg.Timeout for client configuration
+	// Currently timeout is not directly supported by opensearch-go client config
+
+	// Create AWS credentials
+	awsConfig := aws.Config{
+		Region: cfg.Region,
+		Credentials: aws.CredentialsProviderFunc(func(ctx context.Context) (aws.Credentials, error) {
+			return aws.Credentials{
+				AccessKeyID:     cfg.AccessKey,
+				SecretAccessKey: cfg.SecretKey,
+			}, nil
+		}),
+	}
+
+	// Create AWS v4 signer
+	signer := v4.NewSigner()
+
+	// Create request signer for OpenSearch
+	awsSigner, err := requestsigner.NewSignerWithService(awsConfig, "es")
+	if err != nil {
+		return nil, fmt.Errorf("failed to create request signer: %w", err)
+	}
+
+	// Configure OpenSearch client
+	osConfig := opensearch.Config{
+		Addresses: []string{cfg.Endpoint},
+		Transport: &http.Transport{
+			TLSClientConfig: &tls.Config{
+				MinVersion: tls.VersionTLS12,
+			},
+		},
+		Signer: awsSigner,
+	}
+
+	// Create OpenSearch client
+	osClient, err := opensearch.NewClient(osConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create opensearch client: %w", err)
+	}
+
+	return &Client{
+		config: cfg,
+		client: osClient,
+		signer: signer,
+	}, nil
+}
+
+// GetClient returns the underlying OpenSearch client for use by operation packages.
+func (c *Client) GetClient() *opensearch.Client {
+	return c.client
+}
+
+// validateConfig validates the client configuration.
+func validateConfig(cfg *Config) error {
+	if cfg.Endpoint == "" {
+		return errors.New("endpoint is required")
+	}
+	if cfg.Region == "" {
+		return errors.New("region is required")
+	}
+	if cfg.AccessKey == "" {
+		return errors.New("access key is required")
+	}
+	if cfg.SecretKey == "" {
+		return errors.New("secret key is required")
+	}
+	return nil
+}
diff --git a/client/client_test.go b/client/client_test.go
new file mode 100644
index 0000000..38bd830
--- /dev/null
+++ b/client/client_test.go
@@ -0,0 +1,113 @@
+package client
+
+import (
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestNewClient(t *testing.T) {
+	tests := []struct {
+		name    string
+		config  *Config
+		wantErr error
+	}{
+		{
+			name: "valid config",
+			config: &Config{
+				Endpoint:  "https://example.com",
+				Region:    "us-east-1",
+				AccessKey: "test-key",
+				SecretKey: "test-secret",
+			},
+			wantErr: nil,
+		},
+		{
+			name:    "nil config",
+			config:  nil,
+			wantErr: ErrInvalidConfig,
+		},
+		{
+			name: "missing endpoint",
+			config: &Config{
+				Region:    "us-east-1",
+				AccessKey: "test-key",
+				SecretKey: "test-secret",
+			},
+			wantErr: ErrInvalidConfig,
+		},
+		{
+			name: "missing region",
+			config: &Config{
+				Endpoint:  "https://example.com",
+				AccessKey: "test-key",
+				SecretKey: "test-secret",
+			},
+			wantErr: ErrInvalidConfig,
+		},
+		{
+			name: "missing access key",
+			config: &Config{
+				Endpoint:  "https://example.com",
+				Region:    "us-east-1",
+				SecretKey: "test-secret",
+			},
+			wantErr: ErrInvalidConfig,
+		},
+		{
+			name: "missing secret key",
+			config: &Config{
+				Endpoint:  "https://example.com",
+				Region:    "us-east-1",
+				AccessKey: "test-key",
+			},
+			wantErr: ErrInvalidConfig,
+		},
+		{
+			name: "with custom timeout",
+			config: &Config{
+				Endpoint:  "https://example.com",
+				Region:    "us-east-1",
+				AccessKey: "test-key",
+				SecretKey: "test-secret",
+				Timeout:   60 * time.Second,
+			},
+			wantErr: nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := NewClient(tt.config)
+			if !errors.Is(err, tt.wantErr) {
+				t.Errorf("NewClient() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if tt.wantErr == nil && got == nil {
+				t.Error("NewClient() returned nil client with no error")
+			}
+			if tt.wantErr != nil && got != nil {
+				t.Error("NewClient() returned client with error")
+			}
+		})
+	}
+}
+
+func TestClient_GetClient(t *testing.T) {
+	cfg := &Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	client, err := NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	osClient := client.GetClient()
+	if osClient == nil {
+		t.Error("GetClient() returned nil")
+	}
+}
diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..bedd8bf
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,47 @@
+// Package config provides global configuration management for the application.
+// This is a simplified implementation suitable for the experimental phase.
+package config
+
+import (
+	"os"
+
+	"github.com/joho/godotenv"
+)
+
+var (
+	// Endpoint is the OpenSearch cluster endpoint URL.
+	Endpoint string
+
+	// Region is the AWS region where the OpenSearch cluster is located.
+	Region string
+
+	// AccessKey is the AWS access key ID for authentication.
+	AccessKey string
+
+	// SecretKey is the AWS secret access key for authentication.
+	SecretKey string
+)
+
+// Load loads configuration from a .env file and then from environment variables.
+// If the file does not exist, it only loads from environment variables without error.
+func Load(filePath string) error {
+	// Load .env file if it exists
+	// This will set environment variables from the file
+	_ = godotenv.Load(filePath)
+
+	// Initialize global config from environment variables
+	Endpoint = os.Getenv("ES_ENDPOINT")
+	AccessKey = os.Getenv("AWS_ACCESS_KEY_ID")
+	SecretKey = os.Getenv("AWS_SECRET_ACCESS_KEY")
+	Region = os.Getenv("AWS_REGION")
+
+	return nil
+}
+
+// Init initializes the global configuration from environment variables.
+func Init() {
+	Endpoint = os.Getenv("ES_ENDPOINT")
+	AccessKey = os.Getenv("AWS_ACCESS_KEY_ID")
+	SecretKey = os.Getenv("AWS_SECRET_ACCESS_KEY")
+	Region = os.Getenv("AWS_REGION")
+}
diff --git a/config/config_test.go b/config/config_test.go
new file mode 100644
index 0000000..5803e90
--- /dev/null
+++ b/config/config_test.go
@@ -0,0 +1,114 @@
+package config
+
+import (
+	"os"
+	"testing"
+)
+
+func TestInit(t *testing.T) {
+	// Save original env vars
+	origEndpoint := os.Getenv("ES_ENDPOINT")
+	origRegion := os.Getenv("AWS_REGION")
+	origAccessKey := os.Getenv("AWS_ACCESS_KEY_ID")
+	origSecretKey := os.Getenv("AWS_SECRET_ACCESS_KEY")
+
+	// Restore original env vars after test
+	defer func() {
+		os.Setenv("ES_ENDPOINT", origEndpoint)
+		os.Setenv("AWS_REGION", origRegion)
+		os.Setenv("AWS_ACCESS_KEY_ID", origAccessKey)
+		os.Setenv("AWS_SECRET_ACCESS_KEY", origSecretKey)
+	}()
+
+	// Set test env vars
+	os.Setenv("ES_ENDPOINT", "https://test.example.com")
+	os.Setenv("AWS_REGION", "us-west-2")
+	os.Setenv("AWS_ACCESS_KEY_ID", "test-access-key")
+	os.Setenv("AWS_SECRET_ACCESS_KEY", "test-secret-key")
+
+	// Test Init
+	Init()
+
+	if Endpoint != "https://test.example.com" {
+		t.Errorf("Endpoint = %v, want %v", Endpoint, "https://test.example.com")
+	}
+	if Region != "us-west-2" {
+		t.Errorf("Region = %v, want %v", Region, "us-west-2")
+	}
+	if AccessKey != "test-access-key" {
+		t.Errorf("AccessKey = %v, want %v", AccessKey, "test-access-key")
+	}
+	if SecretKey != "test-secret-key" {
+		t.Errorf("SecretKey = %v, want %v", SecretKey, "test-secret-key")
+	}
+}
+
+func TestLoad(t *testing.T) {
+	// Save original env vars
+	origEndpoint := os.Getenv("ES_ENDPOINT")
+	origRegion := os.Getenv("AWS_REGION")
+	origAccessKey := os.Getenv("AWS_ACCESS_KEY_ID")
+	origSecretKey := os.Getenv("AWS_SECRET_ACCESS_KEY")
+
+	// Clear environment variables before test
+	os.Unsetenv("ES_ENDPOINT")
+	os.Unsetenv("AWS_REGION")
+	os.Unsetenv("AWS_ACCESS_KEY_ID")
+	os.Unsetenv("AWS_SECRET_ACCESS_KEY")
+
+	// Restore original env vars after test
+	defer func() {
+		if origEndpoint != "" {
+			os.Setenv("ES_ENDPOINT", origEndpoint)
+		}
+		if origRegion != "" {
+			os.Setenv("AWS_REGION", origRegion)
+		}
+		if origAccessKey != "" {
+			os.Setenv("AWS_ACCESS_KEY_ID", origAccessKey)
+		}
+		if origSecretKey != "" {
+			os.Setenv("AWS_SECRET_ACCESS_KEY", origSecretKey)
+		}
+		// Reload original config
+		Init()
+	}()
+
+	// Create a temporary .env file
+	tmpFile := ".env.test"
+	content := `ES_ENDPOINT=https://test-load.example.com
+AWS_REGION=eu-west-1
+AWS_ACCESS_KEY_ID=load-access-key
+AWS_SECRET_ACCESS_KEY=load-secret-key
+`
+	if err := os.WriteFile(tmpFile, []byte(content), 0644); err != nil {
+		t.Fatalf("failed to create test .env file: %v", err)
+	}
+	defer os.Remove(tmpFile)
+
+	// Test Load
+	if err := Load(tmpFile); err != nil {
+		t.Fatalf("Load() error = %v", err)
+	}
+
+	if Endpoint != "https://test-load.example.com" {
+		t.Errorf("Endpoint = %v, want %v", Endpoint, "https://test-load.example.com")
+	}
+	if Region != "eu-west-1" {
+		t.Errorf("Region = %v, want %v", Region, "eu-west-1")
+	}
+	if AccessKey != "load-access-key" {
+		t.Errorf("AccessKey = %v, want %v", AccessKey, "load-access-key")
+	}
+	if SecretKey != "load-secret-key" {
+		t.Errorf("SecretKey = %v, want %v", SecretKey, "load-secret-key")
+	}
+}
+
+func TestLoad_FileNotFound(t *testing.T) {
+	// Test with non-existent file - should not return error
+	err := Load("non-existent-file.env")
+	if err != nil {
+		t.Errorf("Load() with non-existent file should not error, got %v", err)
+	}
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..86bf047
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,14 @@
+module es-demo
+
+go 1.25.3
+
+require (
+	github.com/aws/aws-sdk-go-v2 v1.39.6
+	github.com/joho/godotenv v1.5.1
+	github.com/opensearch-project/opensearch-go/v2 v2.3.0
+)
+
+require (
+	github.com/aws/aws-sdk-go-v2/config v1.31.20 // indirect
+	github.com/aws/smithy-go v1.23.2 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..4d69f12
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,95 @@
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..34bb74a
--- /dev/null
+++ b/main.go
@@ -0,0 +1,109 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	"es-demo/client"
+	"es-demo/config"
+	"es-demo/operations/cluster"
+	"es-demo/operations/index"
+)
+
+func main() {
+	// Load configuration from .env file and environment variables
+	if err := config.Load(".env"); err != nil {
+		log.Fatalf("Failed to load configuration: %v", err)
+	}
+
+	// Create client configuration
+	cfg := &client.Config{
+		Endpoint:  config.Endpoint,
+		Region:    config.Region,
+		AccessKey: config.AccessKey,
+		SecretKey: config.SecretKey,
+		Timeout:   30 * time.Second,
+	}
+
+	// Create OpenSearch client
+	osClient, err := client.NewClient(cfg)
+	if err != nil {
+		log.Fatalf("Failed to create OpenSearch client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// Get cluster information
+	info, err := cluster.GetInfo(ctx, osClient)
+	if err != nil {
+		log.Fatalf("Failed to get cluster info: %v", err)
+	}
+
+	// Display cluster information
+	fmt.Printf("=== Cluster Information ===\n")
+	fmt.Printf("Cluster Name: %s\n", info.ClusterName)
+	fmt.Printf("Cluster UUID: %s\n", info.ClusterUUID)
+	fmt.Printf("Version: %s\n", info.Version.Number)
+	fmt.Printf("Lucene Version: %s\n", info.Version.LuceneVersion)
+	fmt.Printf("Tagline: %s\n\n", info.Tagline)
+
+	// Example: Create an index template
+	template := &index.Template{
+		IndexPatterns: []string{"logs-*"},
+		Settings: map[string]any{
+			"number_of_shards":   1,
+			"number_of_replicas": 1,
+		},
+		Mappings: map[string]any{
+			"properties": map[string]any{
+				"timestamp": map[string]any{
+					"type": "date",
+				},
+				"message": map[string]any{
+					"type": "text",
+				},
+			},
+		},
+		Priority: 100,
+	}
+
+	fmt.Printf("=== Index Template Operations ===\n")
+
+	// Put template
+	if err := index.PutTemplate(ctx, osClient, "logs-template", template); err != nil {
+		log.Printf("Warning: Failed to create template: %v\n", err)
+	} else {
+		fmt.Printf("✓ Created template: logs-template\n")
+	}
+
+	// Get template
+	retrievedTemplate, err := index.GetTemplate(ctx, osClient, "logs-template")
+	if err != nil {
+		log.Printf("Warning: Failed to get template: %v\n", err)
+	} else {
+		fmt.Printf("✓ Retrieved template: %+v\n", retrievedTemplate.IndexPatterns)
+	}
+
+	// List templates
+	templates, err := index.ListTemplates(ctx, osClient)
+	if err != nil {
+		log.Printf("Warning: Failed to list templates: %v\n", err)
+	} else {
+		fmt.Printf("✓ Total templates: %d\n", len(templates))
+		for name := range templates {
+			fmt.Printf("  - %s\n", name)
+		}
+	}
+
+	// Delete template (commented out to avoid cleanup in demo)
+	// if err := index.DeleteTemplate(ctx, osClient, "logs-template"); err != nil {
+	// 	log.Printf("Warning: Failed to delete template: %v\n", err)
+	// } else {
+	// 	fmt.Printf("✓ Deleted template: logs-template\n")
+	// }
+
+	fmt.Printf("\nDemo completed successfully!\n")
+}
diff --git a/operations/cluster/cluster.go b/operations/cluster/cluster.go
new file mode 100644
index 0000000..3328fa6
--- /dev/null
+++ b/operations/cluster/cluster.go
@@ -0,0 +1,58 @@
+// Package cluster provides cluster-level operations for OpenSearch administration.
+package cluster
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+
+	"es-demo/client"
+
+	"github.com/opensearch-project/opensearch-go/v2/opensearchapi"
+)
+
+// Info represents essential information about the OpenSearch cluster.
+type Info struct {
+	Name        string `json:"name"`
+	ClusterName string `json:"cluster_name"`
+	ClusterUUID string `json:"cluster_uuid"`
+	Version     struct {
+		Number                           string `json:"number"`
+		BuildType                        string `json:"build_type"`
+		BuildHash                        string `json:"build_hash"`
+		BuildDate                        string `json:"build_date"`
+		BuildSnapshot                    bool   `json:"build_snapshot"`
+		LuceneVersion                    string `json:"lucene_version"`
+		MinimumWireCompatibilityVersion  string `json:"minimum_wire_compatibility_version"`
+		MinimumIndexCompatibilityVersion string `json:"minimum_index_compatibility_version"`
+	} `json:"version"`
+	Tagline string `json:"tagline"`
+}
+
+// GetInfo retrieves essential information about the OpenSearch cluster.
+// It returns the cluster information or an error if the request fails.
+func GetInfo(ctx context.Context, c *client.Client) (*Info, error) {
+	req := opensearchapi.InfoRequest{}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute info request: %w", err)
+	}
+	defer func() {
+		if closeErr := res.Body.Close(); closeErr != nil {
+			fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if res.IsError() {
+		return nil, fmt.Errorf("request failed with status: %s", res.Status())
+	}
+
+	var info Info
+	if err := json.NewDecoder(res.Body).Decode(&info); err != nil {
+		return nil, fmt.Errorf("failed to decode cluster info: %w", err)
+	}
+
+	return &info, nil
+}
diff --git a/operations/cluster/cluster_test.go b/operations/cluster/cluster_test.go
new file mode 100644
index 0000000..aedb198
--- /dev/null
+++ b/operations/cluster/cluster_test.go
@@ -0,0 +1,40 @@
+package cluster
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"es-demo/client"
+)
+
+func TestGetInfo(t *testing.T) {
+	// This is a unit test that doesn't require real connection
+	// Integration tests should be run separately
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	cfg := &client.Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	c, err := client.NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// This will fail without a real cluster, which is expected in unit tests
+	_, err = GetInfo(ctx, c)
+	// We just verify the method signature is correct
+	// Real integration tests would check actual responses
+	if err == nil {
+		t.Log("GetInfo succeeded (unexpected in unit test)")
+	}
+}
diff --git a/operations/index/template.go b/operations/index/template.go
new file mode 100644
index 0000000..546b81a
--- /dev/null
+++ b/operations/index/template.go
@@ -0,0 +1,217 @@
+// Package index provides index-level operations for OpenSearch.
+package index
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+
+	"es-demo/client"
+
+	"github.com/opensearch-project/opensearch-go/v2/opensearchapi"
+)
+
+var (
+	// ErrInvalidTemplate is returned when the template configuration is invalid.
+	ErrInvalidTemplate = errors.New("invalid template configuration")
+
+	// ErrTemplateNotFound is returned when the specified template does not exist.
+	ErrTemplateNotFound = errors.New("template not found")
+)
+
+// Template represents an OpenSearch index template.
+type Template struct {
+	// IndexPatterns defines the index patterns this template applies to.
+	IndexPatterns []string `json:"index_patterns"`
+
+	// Settings contains index settings like number of shards and replicas.
+	Settings map[string]any `json:"settings,omitempty"`
+
+	// Mappings defines the field mappings for the index.
+	Mappings map[string]any `json:"mappings,omitempty"`
+
+	// Aliases defines index aliases.
+	Aliases map[string]any `json:"aliases,omitempty"`
+
+	// Priority determines template precedence when multiple templates match.
+	Priority int `json:"priority,omitempty"`
+
+	// Version is used for external version management.
+	Version int `json:"version,omitempty"`
+}
+
+// TemplateResponse represents the response when getting a template.
+type TemplateResponse struct {
+	IndexTemplates []struct {
+		Name          string   `json:"name"`
+		IndexTemplate Template `json:"index_template"`
+	} `json:"index_templates"`
+}
+
+// PutTemplate creates or updates an index template.
+func PutTemplate(ctx context.Context, c *client.Client, name string, template *Template) error {
+	if err := validateTemplate(template); err != nil {
+		return err
+	}
+
+	if name == "" {
+		return fmt.Errorf("%w: template name is required", ErrInvalidTemplate)
+	}
+
+	body, err := json.Marshal(template)
+	if err != nil {
+		return fmt.Errorf("failed to marshal template: %w", err)
+	}
+
+	req := opensearchapi.IndicesPutIndexTemplateRequest{
+		Name: name,
+		Body: bytes.NewReader(body),
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute put template request: %w", err)
+	}
+	defer func() {
+		if closeErr := res.Body.Close(); closeErr != nil {
+			fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return fmt.Errorf("put template failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// GetTemplate retrieves an index template by name.
+func GetTemplate(ctx context.Context, c *client.Client, name string) (*Template, error) {
+	if name == "" {
+		return nil, fmt.Errorf("%w: template name is required", ErrInvalidTemplate)
+	}
+
+	req := opensearchapi.IndicesGetIndexTemplateRequest{
+		Name: []string{name},
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute get template request: %w", err)
+	}
+	defer func() {
+		if closeErr := res.Body.Close(); closeErr != nil {
+			fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if res.IsError() {
+		if res.StatusCode == 404 {
+			return nil, ErrTemplateNotFound
+		}
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return nil, fmt.Errorf("get template failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var response TemplateResponse
+	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode template response: %w", err)
+	}
+
+	if len(response.IndexTemplates) == 0 {
+		return nil, ErrTemplateNotFound
+	}
+
+	return &response.IndexTemplates[0].IndexTemplate, nil
+}
+
+// DeleteTemplate deletes an index template.
+func DeleteTemplate(ctx context.Context, c *client.Client, name string) error {
+	if name == "" {
+		return fmt.Errorf("%w: template name is required", ErrInvalidTemplate)
+	}
+
+	req := opensearchapi.IndicesDeleteIndexTemplateRequest{
+		Name: name,
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute delete template request: %w", err)
+	}
+	defer func() {
+		if closeErr := res.Body.Close(); closeErr != nil {
+			fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if res.IsError() {
+		if res.StatusCode == 404 {
+			return ErrTemplateNotFound
+		}
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return fmt.Errorf("delete template failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// ListTemplates retrieves all index templates or templates matching a pattern.
+func ListTemplates(ctx context.Context, c *client.Client, names ...string) (map[string]*Template, error) {
+	var nameList []string
+	if len(names) > 0 {
+		nameList = names
+	}
+
+	req := opensearchapi.IndicesGetIndexTemplateRequest{
+		Name: nameList,
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute list templates request: %w", err)
+	}
+	defer func() {
+		if closeErr := res.Body.Close(); closeErr != nil {
+			fmt.Fprintf(os.Stderr, "warning: failed to close response body: %v\n", closeErr)
+		}
+	}()
+
+	if res.IsError() {
+		if res.StatusCode == 404 {
+			return make(map[string]*Template), nil
+		}
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return nil, fmt.Errorf("list templates failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var response TemplateResponse
+	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode templates response: %w", err)
+	}
+
+	templates := make(map[string]*Template)
+	for _, item := range response.IndexTemplates {
+		templates[item.Name] = &item.IndexTemplate
+	}
+
+	return templates, nil
+}
+
+// validateTemplate validates the template configuration.
+func validateTemplate(template *Template) error {
+	if template == nil {
+		return fmt.Errorf("%w: template cannot be nil", ErrInvalidTemplate)
+	}
+
+	if len(template.IndexPatterns) == 0 {
+		return fmt.Errorf("%w: index patterns are required", ErrInvalidTemplate)
+	}
+
+	return nil
+}
diff --git a/operations/index/template_test.go b/operations/index/template_test.go
new file mode 100644
index 0000000..b1290f8
--- /dev/null
+++ b/operations/index/template_test.go
@@ -0,0 +1,180 @@
+package index
+
+import (
+	"context"
+	"errors"
+	"testing"
+	"time"
+
+	"es-demo/client"
+)
+
+func TestPutTemplate(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	cfg := &client.Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	c, err := client.NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	template := &Template{
+		IndexPatterns: []string{"test-*"},
+		Settings: map[string]any{
+			"number_of_shards":   1,
+			"number_of_replicas": 0,
+		},
+		Mappings: map[string]any{
+			"properties": map[string]any{
+				"timestamp": map[string]any{
+					"type": "date",
+				},
+			},
+		},
+	}
+
+	// This will fail without a real cluster
+	err = PutTemplate(ctx, c, "test-template", template)
+	if err == nil {
+		t.Log("PutTemplate succeeded (unexpected in unit test)")
+	}
+}
+
+func TestGetTemplate(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	cfg := &client.Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	c, err := client.NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// This will fail without a real cluster
+	_, err = GetTemplate(ctx, c, "test-template")
+	if err == nil {
+		t.Log("GetTemplate succeeded (unexpected in unit test)")
+	}
+}
+
+func TestDeleteTemplate(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	cfg := &client.Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	c, err := client.NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// This will fail without a real cluster
+	err = DeleteTemplate(ctx, c, "test-template")
+	if err == nil {
+		t.Log("DeleteTemplate succeeded (unexpected in unit test)")
+	}
+}
+
+func TestListTemplates(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	cfg := &client.Config{
+		Endpoint:  "https://example.com",
+		Region:    "us-east-1",
+		AccessKey: "test-key",
+		SecretKey: "test-secret",
+	}
+
+	c, err := client.NewClient(cfg)
+	if err != nil {
+		t.Fatalf("failed to create client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	// This will fail without a real cluster
+	_, err = ListTemplates(ctx, c)
+	if err == nil {
+		t.Log("ListTemplates succeeded (unexpected in unit test)")
+	}
+}
+
+func TestTemplate_Validate(t *testing.T) {
+	tests := []struct {
+		name     string
+		template *Template
+		wantErr  error
+	}{
+		{
+			name: "valid template",
+			template: &Template{
+				IndexPatterns: []string{"logs-*"},
+				Settings: map[string]any{
+					"number_of_shards": 1,
+				},
+			},
+			wantErr: nil,
+		},
+		{
+			name:     "nil template",
+			template: nil,
+			wantErr:  ErrInvalidTemplate,
+		},
+		{
+			name: "empty index patterns",
+			template: &Template{
+				IndexPatterns: []string{},
+			},
+			wantErr: ErrInvalidTemplate,
+		},
+		{
+			name: "nil index patterns",
+			template: &Template{
+				IndexPatterns: nil,
+			},
+			wantErr: ErrInvalidTemplate,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := validateTemplate(tt.template)
+			if !errors.Is(err, tt.wantErr) {
+				t.Errorf("validateTemplate() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}
diff --git a/test.ps1 b/test.ps1
new file mode 100644
index 0000000..6632488
--- /dev/null
+++ b/test.ps1
@@ -0,0 +1,213 @@
+# 测试流水线脚本
+# 用途: 执行完整的代码质量检查流程
+# 包括: Linting -> Build -> Test -> Coverage -> Cleanup
+
+param(
+    [switch]$SkipLint,
+    [switch]$SkipBuild,
+    [switch]$SkipTest,
+    [switch]$Verbose
+)
+
+$ErrorActionPreference = "Stop"
+$Script:FailureCount = 0
+
+# 颜色输出函数
+function Write-Success { param($Message) Write-Host "✓ $Message" -ForegroundColor Green }
+function Write-Failure { param($Message) Write-Host "✗ $Message" -ForegroundColor Red; $Script:FailureCount++ }
+function Write-Info { param($Message) Write-Host "→ $Message" -ForegroundColor Cyan }
+function Write-Section { param($Message) Write-Host "`n=== $Message ===" -ForegroundColor Yellow }
+
+# 清理函数
+function Cleanup {
+    Write-Section "Cleanup"
+    
+    # 删除构建产物
+    $artifacts = @("*.exe", "*.test", "coverage.out", "coverage.html")
+    foreach ($pattern in $artifacts) {
+        Get-ChildItem -Path . -Filter $pattern -Recurse -ErrorAction SilentlyContinue | 
+            Remove-Item -Force -ErrorAction SilentlyContinue
+    }
+    
+    # 清理测试生成的临时文件
+    Get-ChildItem -Path . -Filter ".env.test" -Recurse -ErrorAction SilentlyContinue | 
+        Remove-Item -Force -ErrorAction SilentlyContinue
+    
+    Write-Success "Cleanup completed"
+}
+
+# Linting
+function Run-Linting {
+    Write-Section "Code Linting"
+    
+    try {
+        Write-Info "Running golangci-lint..."
+        
+        # 检查 golangci-lint 是否安装
+        $lintPath = Get-Command golangci-lint -ErrorAction SilentlyContinue
+        if (-not $lintPath) {
+            Write-Failure "golangci-lint not found. Please install it first."
+            return $false
+        }
+        
+        # 运行 linter
+        $output = & golangci-lint run --config .golangci.yml ./... 2>&1
+        
+        if ($LASTEXITCODE -eq 0) {
+            Write-Success "Linting passed"
+            return $true
+        } else {
+            Write-Failure "Linting failed"
+            if ($Verbose) {
+                Write-Host $output -ForegroundColor Red
+            }
+            return $false
+        }
+    }
+    catch {
+        Write-Failure "Linting error: $_"
+        return $false
+    }
+}
+
+# Build
+function Run-Build {
+    Write-Section "Build"
+    
+    try {
+        Write-Info "Building project..."
+        
+        # 使用 NUL 设备作为输出（Windows 的 /dev/null）
+        $env:GOOS = ""
+        $env:GOARCH = ""
+        
+        # 构建但不保存二进制文件
+        $output = go build -o NUL . 2>&1
+        
+        if ($LASTEXITCODE -eq 0) {
+            Write-Success "Build successful"
+            return $true
+        } else {
+            Write-Failure "Build failed"
+            if ($Verbose) {
+                Write-Host $output -ForegroundColor Red
+            }
+            return $false
+        }
+    }
+    catch {
+        Write-Failure "Build error: $_"
+        return $false
+    }
+}
+
+# Tests
+function Run-Tests {
+    Write-Section "Tests"
+    
+    try {
+        Write-Info "Running unit tests..."
+        
+        # 运行短测试（跳过集成测试）
+        # 注意: Windows 下不启用 race detector (需要 cgo)
+        # PowerShell 需要使用引号包裹带等号的参数
+        $testOutput = go test -v -short "-coverprofile=coverage.out" ./... 2>&1
+        
+        if ($LASTEXITCODE -eq 0) {
+            Write-Success "All tests passed"
+            
+            # 显示覆盖率摘要
+            Write-Info "Coverage summary:"
+            $coverageOutput = go tool cover -func coverage.out 2>&1
+            $totalLine = $coverageOutput | Select-String "total:"
+            if ($totalLine) {
+                Write-Host "  $totalLine" -ForegroundColor White
+            }
+            
+            # 可选：生成 HTML 覆盖率报告
+            if ($Verbose) {
+                go tool cover -html=coverage.out -o coverage.html
+                Write-Success "Coverage report generated: coverage.html"
+            }
+            
+            return $true
+        } else {
+            Write-Failure "Tests failed"
+            if ($Verbose) {
+                Write-Host $output -ForegroundColor Red
+            }
+            return $false
+        }
+    }
+    catch {
+        Write-Failure "Test error: $_"
+        return $false
+    }
+}
+
+# 主流程
+function Main {
+    Write-Host @"
+╔════════════════════════════════════════╗
+║     ES-Demo Test Pipeline v1.0         ║
+╚════════════════════════════════════════╝
+"@ -ForegroundColor Magenta
+
+    $startTime = Get-Date
+    
+    # 执行流水线步骤
+    $results = @{
+        Lint = $true
+        Build = $true
+        Test = $true
+    }
+    
+    if (-not $SkipLint) {
+        $results.Lint = Run-Linting
+    } else {
+        Write-Info "Skipping linting"
+    }
+    
+    if (-not $SkipBuild) {
+        $results.Build = Run-Build
+    } else {
+        Write-Info "Skipping build"
+    }
+    
+    if (-not $SkipTest) {
+        $results.Test = Run-Tests
+    } else {
+        Write-Info "Skipping tests"
+    }
+    
+    # 清理
+    Cleanup
+    
+    # 结果汇总
+    $endTime = Get-Date
+    $duration = $endTime - $startTime
+    
+    Write-Section "Summary"
+    Write-Host "Lint:  " -NoNewline
+    if ($results.Lint) { Write-Success "PASS" } else { Write-Failure "FAIL" }
+    
+    Write-Host "Build: " -NoNewline
+    if ($results.Build) { Write-Success "PASS" } else { Write-Failure "FAIL" }
+    
+    Write-Host "Test:  " -NoNewline
+    if ($results.Test) { Write-Success "PASS" } else { Write-Failure "FAIL" }
+    
+    Write-Host "`nTotal time: $($duration.TotalSeconds) seconds" -ForegroundColor Cyan
+    
+    # 返回退出码
+    if ($Script:FailureCount -gt 0) {
+        Write-Host "`n❌ Pipeline FAILED with $Script:FailureCount error(s)" -ForegroundColor Red
+        exit 1
+    } else {
+        Write-Host "`n✅ Pipeline PASSED" -ForegroundColor Green
+        exit 0
+    }
+}
+
+# 运行主流程
+Main