feat: 新增index/mapping/document/search接口

README.md

@@ -57,7 +57,17 @@ es-demo/
     │   └── 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
+        ├── template_test.go  # 模板操作测试
+        ├── ism.go            # ISM 策略管理
+        ├── policy.go         # 统一策略接口
+        ├── index.go          # 索引 CRUD 操作
+        ├── index_test.go     # 索引操作测试
+        ├── mapping.go        # 索引 Mapping 管理
+        ├── mapping_test.go   # Mapping 操作测试
+        ├── document.go       # 文档 CRUD 操作
+        ├── document_test.go  # 文档操作测试
+        ├── search.go         # 全文搜索功能
+        └── search_test.go    # 搜索功能测试
 ```
 
 ## 开发原则
@@ -135,16 +145,49 @@ es-demo/
   - ListPolicies: 列出所有策略
   - 策略配置验证
 
+- [x] 索引管理（Index Management）
+  - CreateIndex: 创建索引（支持 Settings 和 Mappings 配置）
+  - GetIndex: 获取索引信息
+  - DeleteIndex: 删除索引
+  - IndexExists: 检查索引是否存在
+  - ListIndices: 列出匹配的索引
+  - 索引名称验证和错误处理
+
+- [x] Mapping 管理（Dynamic Mapping）
+  - PutMapping: 添加/更新字段映射
+  - GetMapping: 获取索引映射信息
+  - AddField: 便捷的单字段添加
+  - FieldMapping 配置：Type、Index、Store、Analyzer、Format、IgnoreAbove
+
+- [x] 文档操作（Document CRUD）
+  - IndexDocument: 索引文档（支持自动生成或指定 ID）
+  - GetDocument: 根据 ID 获取文档
+  - UpdateDocument: 部分更新文档
+  - DeleteDocument: 删除文档
+  - BulkIndexDocuments: 批量索引文档（NDJSON 格式）
+
+- [x] 全文搜索（Search）
+  - Search: 主搜索函数（支持分页、排序、字段过滤）
+  - Query 构建器：
+    - MatchQuery: 全文匹配查询
+    - TermQuery: 精确词项查询
+    - RangeQuery: 范围查询
+    - BoolQuery: 布尔组合查询（Must、Should、MustNot、Filter）
+    - MultiMatchQuery: 多字段匹配
+    - WildcardQuery: 通配符查询
+    - PrefixQuery: 前缀查询
+    - MatchAllQuery: 匹配所有文档
+
 ### 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
+- [ ] 聚合查询（Aggregations）
+- [ ] 复杂查询组合（嵌套、父子文档）
+- [ ] 索引别名管理
+- [ ] 快照和恢复
 - [ ] 性能测试工具
+- [ ] 监控和指标
 
 ## 快速开始
 
@@ -225,14 +268,16 @@ go tool cover -html=coverage.out -o coverage.html
 - [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）
+### 第二阶段：核心功能（已完成）
 
 - [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
+- [x] ISM 策略管理（CRUD）
+- [x] 索引管理功能（创建、删除、查询、列表）
+- [x] Mapping 动态管理（添加字段、获取映射）
+- [x] 文档 CRUD 操作（包含批量索引）
+- [x] 全文搜索功能（多种查询类型）
+- [x] 完善测试覆盖（集成测试 + 单元测试）
 
 ### 第三阶段：高级功能
 

operations/index/document.go

@@ -0,0 +1,312 @@
+// Package index provides index-level operations for OpenSearch.
+package index
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+
+	"es-demo/client"
+
+	"github.com/opensearch-project/opensearch-go/v2/opensearchapi"
+)
+
+var (
+	// ErrDocumentNotFound is returned when the specified document does not exist.
+	ErrDocumentNotFound = fmt.Errorf("document not found")
+)
+
+// Document represents a document in OpenSearch.
+type Document struct {
+	ID     string
+	Source map[string]any
+}
+
+// IndexDocument indexes a document (create or update).
+// If ID is empty, OpenSearch will generate one automatically.
+func IndexDocument(ctx context.Context, c *client.Client, indexName string, doc *Document) (string, error) {
+	if indexName == "" {
+		return "", ErrInvalidIndexName
+	}
+
+	if doc == nil || doc.Source == nil {
+		return "", fmt.Errorf("document cannot be nil")
+	}
+
+	data, err := json.Marshal(doc.Source)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal document: %w", err)
+	}
+
+	req := opensearchapi.IndexRequest{
+		Index:      indexName,
+		DocumentID: doc.ID,
+		Body:       bytes.NewReader(data),
+		Refresh:    "true", // Make document immediately searchable
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return "", fmt.Errorf("failed to execute index document 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("index document failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	// Parse response to get document ID
+	var response struct {
+		ID string `json:"_id"`
+	}
+
+	bodyBytes, _ := io.ReadAll(res.Body)
+	if err := json.Unmarshal(bodyBytes, &response); err != nil {
+		return "", fmt.Errorf("failed to decode response: %w", err)
+	}
+
+	return response.ID, nil
+}
+
+// GetDocument retrieves a document by ID.
+func GetDocument(ctx context.Context, c *client.Client, indexName string, docID string) (*Document, error) {
+	if indexName == "" {
+		return nil, ErrInvalidIndexName
+	}
+
+	if docID == "" {
+		return nil, fmt.Errorf("document ID cannot be empty")
+	}
+
+	req := opensearchapi.GetRequest{
+		Index:      indexName,
+		DocumentID: docID,
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute get document 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.StatusCode == 404 {
+		return nil, ErrDocumentNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return nil, fmt.Errorf("get document failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var response struct {
+		ID     string         `json:"_id"`
+		Found  bool           `json:"found"`
+		Source map[string]any `json:"_source"`
+	}
+
+	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode document: %w", err)
+	}
+
+	if !response.Found {
+		return nil, ErrDocumentNotFound
+	}
+
+	return &Document{
+		ID:     response.ID,
+		Source: response.Source,
+	}, nil
+}
+
+// UpdateDocument updates a document by ID using partial update.
+func UpdateDocument(ctx context.Context, c *client.Client, indexName string, docID string, partialDoc map[string]any) error {
+	if indexName == "" {
+		return ErrInvalidIndexName
+	}
+
+	if docID == "" {
+		return fmt.Errorf("document ID cannot be empty")
+	}
+
+	if len(partialDoc) == 0 {
+		return fmt.Errorf("partial document cannot be empty")
+	}
+
+	updateBody := map[string]any{
+		"doc": partialDoc,
+	}
+
+	data, err := json.Marshal(updateBody)
+	if err != nil {
+		return fmt.Errorf("failed to marshal update body: %w", err)
+	}
+
+	req := opensearchapi.UpdateRequest{
+		Index:      indexName,
+		DocumentID: docID,
+		Body:       bytes.NewReader(data),
+		Refresh:    "true",
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute update document 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.StatusCode == 404 {
+		return ErrDocumentNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return fmt.Errorf("update document failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// DeleteDocument deletes a document by ID.
+func DeleteDocument(ctx context.Context, c *client.Client, indexName string, docID string) error {
+	if indexName == "" {
+		return ErrInvalidIndexName
+	}
+
+	if docID == "" {
+		return fmt.Errorf("document ID cannot be empty")
+	}
+
+	req := opensearchapi.DeleteRequest{
+		Index:      indexName,
+		DocumentID: docID,
+		Refresh:    "true",
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute delete document 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.StatusCode == 404 {
+		return ErrDocumentNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return fmt.Errorf("delete document failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// BulkIndexDocuments indexes multiple documents in a single request.
+func BulkIndexDocuments(ctx context.Context, c *client.Client, indexName string, docs []*Document) error {
+	if indexName == "" {
+		return ErrInvalidIndexName
+	}
+
+	if len(docs) == 0 {
+		return fmt.Errorf("documents cannot be empty")
+	}
+
+	// Build bulk request body
+	var buf bytes.Buffer
+	for _, doc := range docs {
+		// Action line
+		action := map[string]any{
+			"index": map[string]any{
+				"_index": indexName,
+			},
+		}
+		if doc.ID != "" {
+			action["index"].(map[string]any)["_id"] = doc.ID
+		}
+
+		actionData, err := json.Marshal(action)
+		if err != nil {
+			return fmt.Errorf("failed to marshal action: %w", err)
+		}
+		buf.Write(actionData)
+		buf.WriteByte('\n')
+
+		// Document line
+		docData, err := json.Marshal(doc.Source)
+		if err != nil {
+			return fmt.Errorf("failed to marshal document: %w", err)
+		}
+		buf.Write(docData)
+		buf.WriteByte('\n')
+	}
+
+	req := opensearchapi.BulkRequest{
+		Body:    &buf,
+		Refresh: "true",
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute bulk 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("bulk request failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	// Check for errors in bulk response
+	var response struct {
+		Errors bool `json:"errors"`
+		Items  []map[string]struct {
+			Error *struct {
+				Type   string `json:"type"`
+				Reason string `json:"reason"`
+			} `json:"error"`
+		} `json:"items"`
+	}
+
+	bodyBytes, _ := io.ReadAll(res.Body)
+	if err := json.Unmarshal(bodyBytes, &response); err != nil {
+		return fmt.Errorf("failed to decode bulk response: %w", err)
+	}
+
+	if response.Errors {
+		// Collect error details
+		var errorMsg string
+		for i, item := range response.Items {
+			for _, itemData := range item {
+				if itemData.Error != nil {
+					errorMsg += fmt.Sprintf("doc %d: %s - %s; ", i, itemData.Error.Type, itemData.Error.Reason)
+				}
+			}
+		}
+		return fmt.Errorf("bulk indexing had errors: %s", errorMsg)
+	}
+
+	return nil
+}

operations/index/document_test.go

@@ -0,0 +1,368 @@
+package index
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+// TestDocumentIntegration tests complete document lifecycle.
+func TestDocumentIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+
+	indexName := "test-doc-integration"
+
+	// Setup index
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	var docID string
+
+	// Test 1: Index document
+	t.Run("IndexDocument", func(t *testing.T) {
+		doc := &Document{
+			Source: map[string]any{
+				"title":   "Test Document",
+				"content": "This is a test",
+				"count":   42,
+			},
+		}
+
+		id, err := IndexDocument(ctx, c, indexName, doc)
+		if err != nil {
+			t.Fatalf("IndexDocument() error = %v", err)
+		}
+		if id == "" {
+			t.Error("IndexDocument() returned empty ID")
+		}
+		docID = id
+		t.Logf("Document indexed with ID: %s", docID)
+	})
+
+	// Test 2: Get document
+	t.Run("GetDocument", func(t *testing.T) {
+		doc, err := GetDocument(ctx, c, indexName, docID)
+		if err != nil {
+			t.Fatalf("GetDocument() error = %v", err)
+		}
+
+		if doc.ID != docID {
+			t.Errorf("GetDocument() ID = %q, want %q", doc.ID, docID)
+		}
+
+		if doc.Source["title"] != "Test Document" {
+			t.Errorf("GetDocument() title = %v, want %v", doc.Source["title"], "Test Document")
+		}
+
+		t.Logf("Retrieved document: %s", doc.ID)
+	})
+
+	// Test 3: Update document
+	t.Run("UpdateDocument", func(t *testing.T) {
+		updates := map[string]any{
+			"title": "Updated Document",
+			"count": 100,
+		}
+
+		err := UpdateDocument(ctx, c, indexName, docID, updates)
+		if err != nil {
+			t.Fatalf("UpdateDocument() error = %v", err)
+		}
+
+		// Verify update
+		doc, err := GetDocument(ctx, c, indexName, docID)
+		if err != nil {
+			t.Fatalf("GetDocument() error = %v", err)
+		}
+
+		if doc.Source["title"] != "Updated Document" {
+			t.Errorf("Updated title = %v, want %v", doc.Source["title"], "Updated Document")
+		}
+
+		t.Log("Document updated successfully")
+	})
+
+	// Test 4: Delete document
+	t.Run("DeleteDocument", func(t *testing.T) {
+		err := DeleteDocument(ctx, c, indexName, docID)
+		if err != nil {
+			t.Fatalf("DeleteDocument() error = %v", err)
+		}
+
+		// Verify deletion
+		_, err = GetDocument(ctx, c, indexName, docID)
+		if err != ErrDocumentNotFound {
+			t.Errorf("GetDocument() error = %v, want %v", err, ErrDocumentNotFound)
+		}
+
+		t.Log("Document deleted successfully")
+	})
+}
+
+func TestBulkIndexDocuments(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-bulk-index"
+
+	// Setup index
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Create multiple documents
+	docs := []*Document{
+		{
+			ID: "doc1",
+			Source: map[string]any{
+				"title": "Document 1",
+				"value": 1,
+			},
+		},
+		{
+			ID: "doc2",
+			Source: map[string]any{
+				"title": "Document 2",
+				"value": 2,
+			},
+		},
+		{
+			ID: "doc3",
+			Source: map[string]any{
+				"title": "Document 3",
+				"value": 3,
+			},
+		},
+	}
+
+	err = BulkIndexDocuments(ctx, c, indexName, docs)
+	if err != nil {
+		t.Fatalf("BulkIndexDocuments() error = %v", err)
+	}
+
+	// Verify all documents were indexed
+	for _, doc := range docs {
+		retrieved, err := GetDocument(ctx, c, indexName, doc.ID)
+		if err != nil {
+			t.Errorf("GetDocument(%s) error = %v", doc.ID, err)
+			continue
+		}
+
+		if retrieved.Source["title"] != doc.Source["title"] {
+			t.Errorf("Document %s title = %v, want %v", doc.ID, retrieved.Source["title"], doc.Source["title"])
+		}
+	}
+
+	t.Logf("BulkIndexDocuments succeeded: indexed %d documents", len(docs))
+}
+
+func TestIndexDocument(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-index-document"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	doc := &Document{
+		Source: map[string]any{
+			"field1": "value1",
+			"field2": 123,
+		},
+	}
+
+	id, err := IndexDocument(ctx, c, indexName, doc)
+	if err != nil {
+		t.Fatalf("IndexDocument() error = %v", err)
+	}
+
+	if id == "" {
+		t.Error("IndexDocument() returned empty ID")
+	}
+
+	t.Logf("IndexDocument succeeded: %s", id)
+}
+
+func TestGetDocument(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-get-document"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Index a document
+	doc := &Document{
+		ID: "test-doc",
+		Source: map[string]any{
+			"test": "data",
+		},
+	}
+
+	_, err = IndexDocument(ctx, c, indexName, doc)
+	if err != nil {
+		t.Fatalf("setup: IndexDocument() error = %v", err)
+	}
+
+	// Test getting the document
+	retrieved, err := GetDocument(ctx, c, indexName, "test-doc")
+	if err != nil {
+		t.Fatalf("GetDocument() error = %v", err)
+	}
+
+	if retrieved.ID != "test-doc" {
+		t.Errorf("GetDocument() ID = %q, want %q", retrieved.ID, "test-doc")
+	}
+
+	t.Logf("GetDocument succeeded: %s", retrieved.ID)
+}
+
+func TestUpdateDocument(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-update-document"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Index a document
+	doc := &Document{
+		ID: "test-doc",
+		Source: map[string]any{
+			"value": 1,
+		},
+	}
+
+	_, err = IndexDocument(ctx, c, indexName, doc)
+	if err != nil {
+		t.Fatalf("setup: IndexDocument() error = %v", err)
+	}
+
+	// Test update
+	updates := map[string]any{
+		"value": 2,
+	}
+
+	err = UpdateDocument(ctx, c, indexName, "test-doc", updates)
+	if err != nil {
+		t.Fatalf("UpdateDocument() error = %v", err)
+	}
+
+	t.Log("UpdateDocument succeeded")
+}
+
+func TestDeleteDocument(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-delete-document"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Index a document
+	doc := &Document{
+		ID: "test-doc",
+		Source: map[string]any{
+			"test": "data",
+		},
+	}
+
+	_, err = IndexDocument(ctx, c, indexName, doc)
+	if err != nil {
+		t.Fatalf("setup: IndexDocument() error = %v", err)
+	}
+
+	// Test deletion
+	err = DeleteDocument(ctx, c, indexName, "test-doc")
+	if err != nil {
+		t.Fatalf("DeleteDocument() error = %v", err)
+	}
+
+	t.Log("DeleteDocument succeeded")
+}

operations/index/index.go

@@ -0,0 +1,246 @@
+// 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 (
+	// ErrIndexNotFound is returned when the specified index does not exist.
+	ErrIndexNotFound = errors.New("index not found")
+
+	// ErrIndexAlreadyExists is returned when trying to create an index that already exists.
+	ErrIndexAlreadyExists = errors.New("index already exists")
+
+	// ErrInvalidIndexName is returned when the index name is invalid.
+	ErrInvalidIndexName = errors.New("invalid index name")
+)
+
+// IndexSettings represents the settings for an index.
+type IndexSettings struct {
+	NumberOfShards   int `json:"number_of_shards,omitempty"`
+	NumberOfReplicas int `json:"number_of_replicas,omitempty"`
+}
+
+// IndexConfig represents the complete configuration for creating an index.
+type IndexConfig struct {
+	Settings *IndexSettings `json:"settings,omitempty"`
+	Mappings map[string]any `json:"mappings,omitempty"`
+	Aliases  map[string]any `json:"aliases,omitempty"`
+}
+
+// IndexInfo represents information about an index.
+type IndexInfo struct {
+	Name     string
+	Settings *IndexSettings
+	Mappings map[string]any
+	Aliases  map[string]any
+}
+
+// CreateIndex creates a new index with the specified configuration.
+func CreateIndex(ctx context.Context, c *client.Client, name string, config *IndexConfig) error {
+	if name == "" {
+		return ErrInvalidIndexName
+	}
+
+	// Build request body
+	var body io.Reader
+	if config != nil {
+		data, err := json.Marshal(config)
+		if err != nil {
+			return fmt.Errorf("failed to marshal index config: %w", err)
+		}
+		body = bytes.NewReader(data)
+	}
+
+	req := opensearchapi.IndicesCreateRequest{
+		Index: name,
+		Body:  body,
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute create index 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)
+		if res.StatusCode == 400 {
+			return fmt.Errorf("%w: %s", ErrIndexAlreadyExists, string(bodyBytes))
+		}
+		return fmt.Errorf("create index failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// GetIndex retrieves information about an index.
+func GetIndex(ctx context.Context, c *client.Client, name string) (*IndexInfo, error) {
+	if name == "" {
+		return nil, ErrInvalidIndexName
+	}
+
+	req := opensearchapi.IndicesGetRequest{
+		Index: []string{name},
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute get index 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.StatusCode == 404 {
+		return nil, ErrIndexNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return nil, fmt.Errorf("get index failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	// Parse response
+	var response map[string]struct {
+		Settings struct {
+			Index struct {
+				NumberOfShards   string `json:"number_of_shards"`
+				NumberOfReplicas string `json:"number_of_replicas"`
+			} `json:"index"`
+		} `json:"settings"`
+		Mappings map[string]any `json:"mappings"`
+		Aliases  map[string]any `json:"aliases"`
+	}
+
+	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode index info: %w", err)
+	}
+
+	indexData, exists := response[name]
+	if !exists {
+		return nil, ErrIndexNotFound
+	}
+
+	info := &IndexInfo{
+		Name:     name,
+		Mappings: indexData.Mappings,
+		Aliases:  indexData.Aliases,
+	}
+
+	return info, nil
+}
+
+// DeleteIndex deletes an index.
+func DeleteIndex(ctx context.Context, c *client.Client, name string) error {
+	if name == "" {
+		return ErrInvalidIndexName
+	}
+
+	req := opensearchapi.IndicesDeleteRequest{
+		Index: []string{name},
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute delete index 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.StatusCode == 404 {
+		return ErrIndexNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return fmt.Errorf("delete index failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// IndexExists checks if an index exists.
+func IndexExists(ctx context.Context, c *client.Client, name string) (bool, error) {
+	if name == "" {
+		return false, ErrInvalidIndexName
+	}
+
+	req := opensearchapi.IndicesExistsRequest{
+		Index: []string{name},
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return false, fmt.Errorf("failed to execute exists 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)
+		}
+	}()
+
+	return res.StatusCode == 200, nil
+}
+
+// ListIndices lists all indices matching a pattern (use "*" for all).
+func ListIndices(ctx context.Context, c *client.Client, pattern string) ([]string, error) {
+	if pattern == "" {
+		pattern = "*"
+	}
+
+	req := opensearchapi.CatIndicesRequest{
+		Index:  []string{pattern},
+		Format: "json",
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute list indices 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 nil, fmt.Errorf("list indices failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var indices []struct {
+		Index string `json:"index"`
+	}
+
+	if err := json.NewDecoder(res.Body).Decode(&indices); err != nil {
+		return nil, fmt.Errorf("failed to decode indices list: %w", err)
+	}
+
+	result := make([]string, len(indices))
+	for i, idx := range indices {
+		result[i] = idx.Index
+	}
+
+	return result, nil
+}

operations/index/index_test.go

@@ -0,0 +1,297 @@
+package index
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+// TestIndexIntegration tests complete index lifecycle.
+func TestIndexIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+
+	indexName := "test-index-integration"
+
+	// Cleanup before and after test
+	_ = DeleteIndex(ctx, c, indexName)
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Test 1: Create index
+	t.Run("CreateIndex", func(t *testing.T) {
+		config := &IndexConfig{
+			Settings: &IndexSettings{
+				NumberOfShards:   1,
+				NumberOfReplicas: 0,
+			},
+			Mappings: map[string]any{
+				"properties": map[string]any{
+					"title": map[string]any{
+						"type": "text",
+					},
+					"count": map[string]any{
+						"type": "integer",
+					},
+				},
+			},
+		}
+
+		err := CreateIndex(ctx, c, indexName, config)
+		if err != nil {
+			t.Fatalf("CreateIndex() error = %v", err)
+		}
+		t.Log("Index created successfully")
+	})
+
+	// Test 2: Index exists
+	t.Run("IndexExists", func(t *testing.T) {
+		exists, err := IndexExists(ctx, c, indexName)
+		if err != nil {
+			t.Fatalf("IndexExists() error = %v", err)
+		}
+		if !exists {
+			t.Error("IndexExists() = false, want true")
+		}
+		t.Log("Index exists check passed")
+	})
+
+	// Test 3: Get index
+	t.Run("GetIndex", func(t *testing.T) {
+		info, err := GetIndex(ctx, c, indexName)
+		if err != nil {
+			t.Fatalf("GetIndex() error = %v", err)
+		}
+		if info.Name != indexName {
+			t.Errorf("GetIndex() name = %q, want %q", info.Name, indexName)
+		}
+		t.Logf("Retrieved index: %s", info.Name)
+	})
+
+	// Test 4: List indices
+	t.Run("ListIndices", func(t *testing.T) {
+		indices, err := ListIndices(ctx, c, "test-*")
+		if err != nil {
+			t.Fatalf("ListIndices() error = %v", err)
+		}
+
+		found := false
+		for _, idx := range indices {
+			if idx == indexName {
+				found = true
+				break
+			}
+		}
+
+		if !found {
+			t.Errorf("Index %q not found in list", indexName)
+		}
+		t.Logf("Found %d indices", len(indices))
+	})
+
+	// Test 5: Delete index
+	t.Run("DeleteIndex", func(t *testing.T) {
+		err := DeleteIndex(ctx, c, indexName)
+		if err != nil {
+			t.Fatalf("DeleteIndex() error = %v", err)
+		}
+
+		// Verify deletion
+		exists, err := IndexExists(ctx, c, indexName)
+		if err != nil {
+			t.Fatalf("IndexExists() error = %v", err)
+		}
+		if exists {
+			t.Error("Index still exists after deletion")
+		}
+		t.Log("Index deleted successfully")
+	})
+}
+
+func TestCreateIndex(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-create-index"
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	config := &IndexConfig{
+		Settings: &IndexSettings{
+			NumberOfShards:   1,
+			NumberOfReplicas: 0,
+		},
+	}
+
+	err := CreateIndex(ctx, c, indexName, config)
+	if err != nil {
+		t.Fatalf("CreateIndex() error = %v", err)
+	}
+
+	t.Log("CreateIndex succeeded")
+}
+
+func TestGetIndex(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-get-index"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Test getting the index
+	info, err := GetIndex(ctx, c, indexName)
+	if err != nil {
+		t.Fatalf("GetIndex() error = %v", err)
+	}
+
+	if info.Name != indexName {
+		t.Errorf("GetIndex() name = %q, want %q", info.Name, indexName)
+	}
+
+	t.Logf("GetIndex succeeded: %s", info.Name)
+}
+
+func TestDeleteIndex(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-delete-index"
+
+	// Create index
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	// Test deletion
+	err = DeleteIndex(ctx, c, indexName)
+	if err != nil {
+		t.Fatalf("DeleteIndex() error = %v", err)
+	}
+
+	t.Log("DeleteIndex succeeded")
+}
+
+func TestIndexExists(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-exists-index"
+
+	// Test non-existent index
+	exists, err := IndexExists(ctx, c, indexName)
+	if err != nil {
+		t.Fatalf("IndexExists() error = %v", err)
+	}
+	if exists {
+		t.Error("IndexExists() = true for non-existent index")
+	}
+
+	// Create index
+	err = CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Test existing index
+	exists, err = IndexExists(ctx, c, indexName)
+	if err != nil {
+		t.Fatalf("IndexExists() error = %v", err)
+	}
+	if !exists {
+		t.Error("IndexExists() = false for existing index")
+	}
+
+	t.Log("IndexExists succeeded")
+}
+
+func TestListIndices(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indices, err := ListIndices(ctx, c, "*")
+	if err != nil {
+		t.Fatalf("ListIndices() error = %v", err)
+	}
+
+	if indices == nil {
+		t.Error("ListIndices() returned nil")
+	}
+
+	t.Logf("ListIndices succeeded: found %d indices", len(indices))
+}
+
+// Unit tests for validation
+func TestCreateIndex_Validation(t *testing.T) {
+	ctx := context.Background()
+
+	tests := []struct {
+		name      string
+		indexName string
+		wantErr   error
+	}{
+		{
+			name:      "empty index name",
+			indexName: "",
+			wantErr:   ErrInvalidIndexName,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Pass nil client to only test validation logic
+			err := CreateIndex(ctx, nil, tt.indexName, nil)
+			if err != tt.wantErr {
+				t.Errorf("CreateIndex() error = %v, want %v", err, tt.wantErr)
+			}
+		})
+	}
+}

operations/index/mapping.go

@@ -0,0 +1,124 @@
+// Package index provides index-level operations for OpenSearch.
+package index
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+
+	"es-demo/client"
+
+	"github.com/opensearch-project/opensearch-go/v2/opensearchapi"
+)
+
+// FieldMapping represents a field mapping configuration.
+type FieldMapping struct {
+	Type   string         `json:"type"`
+	Fields map[string]any `json:"fields,omitempty"`
+	// Common field options
+	Index       *bool  `json:"index,omitempty"`
+	Store       *bool  `json:"store,omitempty"`
+	Analyzer    string `json:"analyzer,omitempty"`
+	Format      string `json:"format,omitempty"`
+	IgnoreAbove int    `json:"ignore_above,omitempty"`
+}
+
+// PutMapping updates the mapping for an index by adding new fields.
+// Note: Existing field mappings cannot be changed in OpenSearch.
+func PutMapping(ctx context.Context, c *client.Client, indexName string, properties map[string]FieldMapping) error {
+	if indexName == "" {
+		return ErrInvalidIndexName
+	}
+
+	if len(properties) == 0 {
+		return fmt.Errorf("properties cannot be empty")
+	}
+
+	// Build mapping request
+	mappingBody := map[string]any{
+		"properties": properties,
+	}
+
+	data, err := json.Marshal(mappingBody)
+	if err != nil {
+		return fmt.Errorf("failed to marshal mapping: %w", err)
+	}
+
+	req := opensearchapi.IndicesPutMappingRequest{
+		Index: []string{indexName},
+		Body:  bytes.NewReader(data),
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return fmt.Errorf("failed to execute put mapping 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 mapping failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	return nil
+}
+
+// GetMapping retrieves the mapping for an index.
+func GetMapping(ctx context.Context, c *client.Client, indexName string) (map[string]any, error) {
+	if indexName == "" {
+		return nil, ErrInvalidIndexName
+	}
+
+	req := opensearchapi.IndicesGetMappingRequest{
+		Index: []string{indexName},
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute get mapping 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.StatusCode == 404 {
+		return nil, ErrIndexNotFound
+	}
+
+	if res.IsError() {
+		bodyBytes, _ := io.ReadAll(res.Body)
+		return nil, fmt.Errorf("get mapping failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var response map[string]struct {
+		Mappings map[string]any `json:"mappings"`
+	}
+
+	if err := json.NewDecoder(res.Body).Decode(&response); err != nil {
+		return nil, fmt.Errorf("failed to decode mapping response: %w", err)
+	}
+
+	indexData, exists := response[indexName]
+	if !exists {
+		return nil, ErrIndexNotFound
+	}
+
+	return indexData.Mappings, nil
+}
+
+// AddField adds a new field to the index mapping.
+// This is a convenience wrapper around PutMapping for adding a single field.
+func AddField(ctx context.Context, c *client.Client, indexName string, fieldName string, mapping FieldMapping) error {
+	return PutMapping(ctx, c, indexName, map[string]FieldMapping{
+		fieldName: mapping,
+	})
+}

operations/index/mapping_test.go

@@ -0,0 +1,204 @@
+package index
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+// TestMappingIntegration tests mapping operations.
+func TestMappingIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+
+	indexName := "test-mapping-integration"
+
+	// Setup index
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Test 1: Add field
+	t.Run("AddField", func(t *testing.T) {
+		mapping := FieldMapping{
+			Type: "text",
+		}
+
+		err := AddField(ctx, c, indexName, "new_field", mapping)
+		if err != nil {
+			t.Fatalf("AddField() error = %v", err)
+		}
+
+		t.Log("Field added successfully")
+	})
+
+	// Test 2: Get mapping
+	t.Run("GetMapping", func(t *testing.T) {
+		mappings, err := GetMapping(ctx, c, indexName)
+		if err != nil {
+			t.Fatalf("GetMapping() error = %v", err)
+		}
+
+		if mappings == nil {
+			t.Error("GetMapping() returned nil")
+		}
+
+		t.Logf("Retrieved mappings for index %s", indexName)
+	})
+
+	// Test 3: Put mapping with multiple fields
+	t.Run("PutMapping", func(t *testing.T) {
+		properties := map[string]FieldMapping{
+			"title": {
+				Type: "text",
+			},
+			"count": {
+				Type: "integer",
+			},
+			"timestamp": {
+				Type:   "date",
+				Format: "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis",
+			},
+		}
+
+		err := PutMapping(ctx, c, indexName, properties)
+		if err != nil {
+			t.Fatalf("PutMapping() error = %v", err)
+		}
+
+		t.Log("Mapping updated successfully")
+	})
+}
+
+func TestPutMapping(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-put-mapping"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	properties := map[string]FieldMapping{
+		"name": {
+			Type: "text",
+		},
+		"age": {
+			Type: "integer",
+		},
+	}
+
+	err = PutMapping(ctx, c, indexName, properties)
+	if err != nil {
+		t.Fatalf("PutMapping() error = %v", err)
+	}
+
+	t.Log("PutMapping succeeded")
+}
+
+func TestGetMapping(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-get-mapping"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup with initial mapping
+	config := &IndexConfig{
+		Mappings: map[string]any{
+			"properties": map[string]any{
+				"field1": map[string]any{
+					"type": "text",
+				},
+			},
+		},
+	}
+
+	err := CreateIndex(ctx, c, indexName, config)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	mappings, err := GetMapping(ctx, c, indexName)
+	if err != nil {
+		t.Fatalf("GetMapping() error = %v", err)
+	}
+
+	if mappings == nil {
+		t.Error("GetMapping() returned nil")
+	}
+
+	t.Log("GetMapping succeeded")
+}
+
+func TestAddField(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-add-field"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	mapping := FieldMapping{
+		Type: "keyword",
+	}
+
+	err = AddField(ctx, c, indexName, "status", mapping)
+	if err != nil {
+		t.Fatalf("AddField() error = %v", err)
+	}
+
+	t.Log("AddField succeeded")
+}

operations/index/search.go

@@ -0,0 +1,187 @@
+// Package index provides index-level operations for OpenSearch.
+package index
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+
+	"es-demo/client"
+
+	"github.com/opensearch-project/opensearch-go/v2/opensearchapi"
+)
+
+// SearchQuery represents a search query configuration.
+type SearchQuery struct {
+	// Query is the search query DSL
+	Query map[string]any `json:"query,omitempty"`
+
+	// Size is the maximum number of hits to return (default: 10)
+	Size int `json:"size,omitempty"`
+
+	// From is the starting offset (for pagination)
+	From int `json:"from,omitempty"`
+
+	// Sort defines the sort order
+	Sort []map[string]any `json:"sort,omitempty"`
+
+	// Source defines which fields to return
+	Source any `json:"_source,omitempty"`
+}
+
+// SearchResult represents search results.
+type SearchResult struct {
+	Took int64 `json:"took"`
+	Hits struct {
+		Total struct {
+			Value    int64  `json:"value"`
+			Relation string `json:"relation"`
+		} `json:"total"`
+		MaxScore *float64 `json:"max_score"`
+		Hits     []Hit    `json:"hits"`
+	} `json:"hits"`
+}
+
+// Hit represents a single search result hit.
+type Hit struct {
+	Index  string         `json:"_index"`
+	ID     string         `json:"_id"`
+	Score  *float64       `json:"_score"`
+	Source map[string]any `json:"_source"`
+}
+
+// Search performs a search query on an index.
+func Search(ctx context.Context, c *client.Client, indexName string, query *SearchQuery) (*SearchResult, error) {
+	if indexName == "" {
+		return nil, ErrInvalidIndexName
+	}
+
+	if query == nil {
+		query = &SearchQuery{}
+	}
+
+	// Set defaults
+	if query.Size == 0 {
+		query.Size = 10
+	}
+
+	data, err := json.Marshal(query)
+	if err != nil {
+		return nil, fmt.Errorf("failed to marshal search query: %w", err)
+	}
+
+	req := opensearchapi.SearchRequest{
+		Index: []string{indexName},
+		Body:  bytes.NewReader(data),
+	}
+
+	res, err := req.Do(ctx, c.GetClient())
+	if err != nil {
+		return nil, fmt.Errorf("failed to execute search 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 nil, fmt.Errorf("search failed with status %s: %s", res.Status(), string(bodyBytes))
+	}
+
+	var result SearchResult
+	if err := json.NewDecoder(res.Body).Decode(&result); err != nil {
+		return nil, fmt.Errorf("failed to decode search result: %w", err)
+	}
+
+	return &result, nil
+}
+
+// MatchQuery creates a match query for full-text search.
+func MatchQuery(field string, value any) map[string]any {
+	return map[string]any{
+		"match": map[string]any{
+			field: value,
+		},
+	}
+}
+
+// TermQuery creates a term query for exact matching.
+func TermQuery(field string, value any) map[string]any {
+	return map[string]any{
+		"term": map[string]any{
+			field: value,
+		},
+	}
+}
+
+// RangeQuery creates a range query.
+func RangeQuery(field string, gte, lte any) map[string]any {
+	rangeMap := make(map[string]any)
+	if gte != nil {
+		rangeMap["gte"] = gte
+	}
+	if lte != nil {
+		rangeMap["lte"] = lte
+	}
+
+	return map[string]any{
+		"range": map[string]any{
+			field: rangeMap,
+		},
+	}
+}
+
+// BoolQuery creates a bool query for combining multiple queries.
+type BoolQuery struct {
+	Must    []map[string]any `json:"must,omitempty"`
+	Should  []map[string]any `json:"should,omitempty"`
+	MustNot []map[string]any `json:"must_not,omitempty"`
+	Filter  []map[string]any `json:"filter,omitempty"`
+}
+
+// ToBoolQuery converts BoolQuery to query DSL.
+func (b *BoolQuery) ToBoolQuery() map[string]any {
+	return map[string]any{
+		"bool": b,
+	}
+}
+
+// MatchAllQuery creates a match_all query.
+func MatchAllQuery() map[string]any {
+	return map[string]any{
+		"match_all": map[string]any{},
+	}
+}
+
+// MultiMatchQuery creates a multi_match query for searching across multiple fields.
+func MultiMatchQuery(value any, fields ...string) map[string]any {
+	return map[string]any{
+		"multi_match": map[string]any{
+			"query":  value,
+			"fields": fields,
+		},
+	}
+}
+
+// WildcardQuery creates a wildcard query.
+func WildcardQuery(field string, value string) map[string]any {
+	return map[string]any{
+		"wildcard": map[string]any{
+			field: value,
+		},
+	}
+}
+
+// PrefixQuery creates a prefix query.
+func PrefixQuery(field string, value string) map[string]any {
+	return map[string]any{
+		"prefix": map[string]any{
+			field: value,
+		},
+	}
+}

operations/index/search_test.go

@@ -0,0 +1,343 @@
+package index
+
+import (
+	"context"
+	"testing"
+	"time"
+)
+
+// TestSearchIntegration tests search operations.
+func TestSearchIntegration(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Second)
+	defer cancel()
+
+	indexName := "test-search-integration"
+
+	// Setup index with mapping
+	config := &IndexConfig{
+		Mappings: map[string]any{
+			"properties": map[string]any{
+				"title": map[string]any{
+					"type": "text",
+				},
+				"category": map[string]any{
+					"type": "keyword",
+				},
+				"price": map[string]any{
+					"type": "integer",
+				},
+			},
+		},
+	}
+
+	err := CreateIndex(ctx, c, indexName, config)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Index test documents
+	docs := []*Document{
+		{
+			ID: "1",
+			Source: map[string]any{
+				"title":    "Go Programming Language",
+				"category": "books",
+				"price":    50,
+			},
+		},
+		{
+			ID: "2",
+			Source: map[string]any{
+				"title":    "Python for Beginners",
+				"category": "books",
+				"price":    40,
+			},
+		},
+		{
+			ID: "3",
+			Source: map[string]any{
+				"title":    "JavaScript Guide",
+				"category": "books",
+				"price":    45,
+			},
+		},
+	}
+
+	err = BulkIndexDocuments(ctx, c, indexName, docs)
+	if err != nil {
+		t.Fatalf("setup: BulkIndexDocuments() error = %v", err)
+	}
+
+	// Give ES a moment to index
+	time.Sleep(1 * time.Second)
+
+	// Test 1: Match query
+	t.Run("MatchQuery", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: MatchQuery("title", "Programming"),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value == 0 {
+			t.Error("Search() returned no results")
+		}
+
+		t.Logf("Match query found %d results", result.Hits.Total.Value)
+	})
+
+	// Test 2: Term query
+	t.Run("TermQuery", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: TermQuery("category", "books"),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value != 3 {
+			t.Errorf("Term query found %d results, want 3", result.Hits.Total.Value)
+		}
+
+		t.Logf("Term query found %d results", result.Hits.Total.Value)
+	})
+
+	// Test 3: Range query
+	t.Run("RangeQuery", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: RangeQuery("price", 40, 50),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value == 0 {
+			t.Error("Range query returned no results")
+		}
+
+		t.Logf("Range query found %d results", result.Hits.Total.Value)
+	})
+
+	// Test 4: Bool query
+	t.Run("BoolQuery", func(t *testing.T) {
+		boolQ := &BoolQuery{
+			Must: []map[string]any{
+				TermQuery("category", "books"),
+			},
+			Filter: []map[string]any{
+				RangeQuery("price", nil, 45),
+			},
+		}
+
+		query := &SearchQuery{
+			Query: boolQ.ToBoolQuery(),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value == 0 {
+			t.Error("Bool query returned no results")
+		}
+
+		t.Logf("Bool query found %d results", result.Hits.Total.Value)
+	})
+
+	// Test 5: Match all query
+	t.Run("MatchAllQuery", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: MatchAllQuery(),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value != 3 {
+			t.Errorf("Match all query found %d results, want 3", result.Hits.Total.Value)
+		}
+
+		t.Logf("Match all query found %d results", result.Hits.Total.Value)
+	})
+
+	// Test 6: Pagination
+	t.Run("Pagination", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: MatchAllQuery(),
+			Size:  1,
+			From:  1,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if len(result.Hits.Hits) != 1 {
+			t.Errorf("Pagination returned %d hits, want 1", len(result.Hits.Hits))
+		}
+
+		t.Log("Pagination test passed")
+	})
+
+	// Test 7: Multi-match query
+	t.Run("MultiMatchQuery", func(t *testing.T) {
+		query := &SearchQuery{
+			Query: MultiMatchQuery("Programming", "title", "category"),
+			Size:  10,
+		}
+
+		result, err := Search(ctx, c, indexName, query)
+		if err != nil {
+			t.Fatalf("Search() error = %v", err)
+		}
+
+		if result.Hits.Total.Value == 0 {
+			t.Error("Multi-match query returned no results")
+		}
+
+		t.Logf("Multi-match query found %d results", result.Hits.Total.Value)
+	})
+}
+
+func TestSearch(t *testing.T) {
+	if testing.Short() {
+		t.Skip("skipping integration test in short mode")
+	}
+
+	c := setupIntegrationTest(t)
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	indexName := "test-search"
+
+	// Cleanup any existing index first
+	_ = DeleteIndex(ctx, c, indexName)
+
+	// Setup
+	err := CreateIndex(ctx, c, indexName, nil)
+	if err != nil {
+		t.Fatalf("setup: CreateIndex() error = %v", err)
+	}
+
+	defer func() {
+		_ = DeleteIndex(ctx, c, indexName)
+	}()
+
+	// Index a document
+	doc := &Document{
+		Source: map[string]any{
+			"message": "test search",
+		},
+	}
+
+	_, err = IndexDocument(ctx, c, indexName, doc)
+	if err != nil {
+		t.Fatalf("setup: IndexDocument() error = %v", err)
+	}
+
+	// Give ES a moment
+	time.Sleep(1 * time.Second)
+
+	query := &SearchQuery{
+		Query: MatchAllQuery(),
+		Size:  10,
+	}
+
+	result, err := Search(ctx, c, indexName, query)
+	if err != nil {
+		t.Fatalf("Search() error = %v", err)
+	}
+
+	if result == nil {
+		t.Error("Search() returned nil")
+	}
+
+	t.Logf("Search succeeded: found %d results", result.Hits.Total.Value)
+}
+
+func TestMatchQuery(t *testing.T) {
+	query := MatchQuery("field", "value")
+
+	if query == nil {
+		t.Error("MatchQuery() returned nil")
+	}
+
+	if _, ok := query["match"]; !ok {
+		t.Error("MatchQuery() missing 'match' key")
+	}
+
+	t.Log("MatchQuery test passed")
+}
+
+func TestTermQuery(t *testing.T) {
+	query := TermQuery("field", "value")
+
+	if query == nil {
+		t.Error("TermQuery() returned nil")
+	}
+
+	if _, ok := query["term"]; !ok {
+		t.Error("TermQuery() missing 'term' key")
+	}
+
+	t.Log("TermQuery test passed")
+}
+
+func TestRangeQuery(t *testing.T) {
+	query := RangeQuery("age", 18, 65)
+
+	if query == nil {
+		t.Error("RangeQuery() returned nil")
+	}
+
+	if _, ok := query["range"]; !ok {
+		t.Error("RangeQuery() missing 'range' key")
+	}
+
+	t.Log("RangeQuery test passed")
+}
+
+func TestBoolQuery(t *testing.T) {
+	boolQ := &BoolQuery{
+		Must: []map[string]any{
+			MatchQuery("field", "value"),
+		},
+	}
+
+	query := boolQ.ToBoolQuery()
+
+	if query == nil {
+		t.Error("ToBoolQuery() returned nil")
+	}
+
+	if _, ok := query["bool"]; !ok {
+		t.Error("ToBoolQuery() missing 'bool' key")
+	}
+
+	t.Log("BoolQuery test passed")
+}