feat: 增加ism管理接口

test: 索引模板和ism的单元测试和集成测试

operations/index/template.go

@@ -62,7 +62,37 @@ func PutTemplate(ctx context.Context, c *client.Client, name string, template *T
 		return fmt.Errorf("%w: template name is required", ErrInvalidTemplate)
 	}
 
-	body, err := json.Marshal(template)
+	// Build template object with only non-empty fields
+	templateObj := make(map[string]any)
+	if len(template.Settings) > 0 {
+		templateObj["settings"] = template.Settings
+	}
+	if len(template.Mappings) > 0 {
+		templateObj["mappings"] = template.Mappings
+	}
+	if len(template.Aliases) > 0 {
+		templateObj["aliases"] = template.Aliases
+	}
+
+	// Wrap template in template field for the API
+	requestBody := map[string]any{
+		"index_patterns": template.IndexPatterns,
+	}
+
+	// Only add template field if it has content
+	if len(templateObj) > 0 {
+		requestBody["template"] = templateObj
+	}
+
+	// Add optional fields
+	if template.Priority > 0 {
+		requestBody["priority"] = template.Priority
+	}
+	if template.Version > 0 {
+		requestBody["version"] = template.Version
+	}
+
+	body, err := json.Marshal(requestBody)
 	if err != nil {
 		return fmt.Errorf("failed to marshal template: %w", err)
 	}