diff --git a/HighLevelDesign.md b/HighLevelDesign.md
index 397a9f7..3e728c9 100644
--- a/HighLevelDesign.md
+++ b/HighLevelDesign.md
@@ -112,10 +112,9 @@ if response.status_code == 200:
 支持多种匹配方式，如AND、OR、RANK、NOTAND以及()，优先级从高到低为()，ANDNOT，AND，OR，RANK。
 
 default域的相关性，是代码里面单独计算，是特定的深度定制优化的，暂时不做配置化。
-多语言搜索：
-对外提供的服务 用default域搜索就行，但是内部需要通过配置翻译为多种语言（配置几种目标语言 默认中文、英文，并且设置对应的检索域），然后分别到对应的字段搜索，中文字段到配置的中文title搜索，英文到对应的英文title搜索。
 
 暂时具体实现为 bm25()+0.2*text_embedding_relevence（也就是knn检索表达式的打分）
+bm25() 包括多语言的打分：内部需要通过配置翻译为多种语言（配置几种目标语言 默认中文、英文，并且设置对应的检索域），然后分别到对应的字段搜索，中文字段到配置的中文title搜索，英文到对应的英文title搜索。
 bm25打分（base_query）：
 "multi_match": {
     "query": search_query,
diff --git a/MULTILANG_FEATURE.md b/MULTILANG_FEATURE.md
new file mode 100644
index 0000000..5571710
--- /dev/null
+++ b/MULTILANG_FEATURE.md
@@ -0,0 +1,219 @@
+# 多语言标题索引功能说明
+
+## 功能概述
+
+本功能实现了多语言标题索引的支持，允许不同语言的标题字段使用对应的分词器，同时对外提供统一的搜索接口。
+
+## 主要特性
+
+1. **多语言字段分离索引**：不同语言的标题字段（中文、英文、俄文等）使用对应的分词器
+2. **统一的搜索接口**：对外仍然使用 `default` 域搜索，内部自动处理多语言路由
+3. **智能查询路由**：根据查询语言和配置，将查询路由到对应的语言字段
+
+## 配置说明
+
+### 字段配置
+
+在 `customer1_config.yaml` 中，需要为不同语言的标题字段配置对应的分词器：
+
+```yaml
+fields:
+  # 中文标题 - 使用中文电商分词器
+  - name: "name"
+    type: "TEXT"
+    analyzer: "chinese_ecommerce"
+    boost: 2.0
+    
+  # 英文标题 - 使用英文分词器
+  - name: "enSpuName"
+    type: "TEXT"
+    analyzer: "english"
+    boost: 2.0
+    
+  # 俄文标题 - 使用俄文分词器
+  - name: "ruSkuName"
+    type: "TEXT"
+    analyzer: "russian"
+    boost: 2.0
+```
+
+### 索引域配置
+
+在索引配置中添加 `language_field_mapping` 来指定每种语言对应的字段：
+
+```yaml
+indexes:
+  - name: "default"
+    label: "默认索引"
+    fields:
+      - "name"
+      - "enSpuName"
+      - "ruSkuName"
+      - "categoryName"
+      - "brandName"
+    analyzer: "chinese_ecommerce"
+    boost: 1.0
+    language_field_mapping:
+      zh:
+        - "name"
+        - "categoryName"
+        - "brandName"
+      en:
+        - "enSpuName"
+      ru:
+        - "ruSkuName"
+
+  - name: "title"
+    label: "标题索引"
+    fields:
+      - "name"
+      - "enSpuName"
+      - "ruSkuName"
+    analyzer: "chinese_ecommerce"
+    boost: 2.0
+    language_field_mapping:
+      zh:
+        - "name"
+      en:
+        - "enSpuName"
+      ru:
+        - "ruSkuName"
+```
+
+### 查询配置
+
+在 `query_config` 中配置支持的语言：
+
+```yaml
+query_config:
+  supported_languages:
+    - "zh"
+    - "en"
+    - "ru"
+  default_language: "zh"
+  enable_translation: true
+  enable_text_embedding: true
+```
+
+## 工作原理
+
+### 1. 查询解析阶段
+
+当用户输入查询时：
+1. **语言检测**：自动检测查询语言（中文、英文、俄文等）
+2. **翻译生成**：如果启用了翻译，将查询翻译到其他支持的语言
+3. **域提取**：如果查询包含域前缀（如 `title:查询`），提取域信息
+
+### 2. 查询构建阶段
+
+对于有 `language_field_mapping` 的域：
+
+1. **检测语言查询**：使用检测到的语言和原始查询，搜索对应语言的字段
+   - 例如：中文查询 "芭比娃娃" → 搜索 `name` 字段（中文分词器）
+
+2. **翻译语言查询**：使用翻译后的查询，搜索对应语言的字段
+   - 例如：中文查询翻译为英文 "Barbie doll" → 搜索 `enSpuName` 字段（英文分词器）
+
+3. **查询组合**：将多个语言查询组合为 `should` 子句，提高召回率
+   - 检测语言的查询权重更高（boost * 1.5）
+   - 翻译语言的查询使用正常权重（boost * 1.0）
+
+### 3. 字段级别分析器
+
+Elasticsearch 会自动为每个字段使用其配置的分析器：
+- `name` 字段使用 `chinese_ecommerce` 分词器
+- `enSpuName` 字段使用 `english` 分词器
+- `ruSkuName` 字段使用 `russian` 分词器
+
+## 使用示例
+
+### 示例 1: 默认域搜索（中文查询）
+
+```
+查询: "芭比娃娃"
+域: default
+检测语言: zh
+```
+
+**生成的查询**：
+- 中文查询 "芭比娃娃" → 搜索 `name`, `categoryName`, `brandName` 字段（boost * 1.5）
+- 英文翻译 "Barbie doll" → 搜索 `enSpuName` 字段（boost * 1.0）
+- 俄文翻译 "Кукла Барби" → 搜索 `ruSkuName` 字段（boost * 1.0）
+
+### 示例 2: 标题域搜索（英文查询）
+
+```
+查询: "title:Barbie doll"
+域: title
+检测语言: en
+```
+
+**生成的查询**：
+- 英文查询 "Barbie doll" → 搜索 `enSpuName` 字段（boost * 2.0 * 1.5）
+- 中文翻译 "芭比娃娃" → 搜索 `name` 字段（boost * 2.0）
+- 俄文翻译 "Кукла Барби" → 搜索 `ruSkuName` 字段（boost * 2.0）
+
+### 示例 3: 无语言映射的域
+
+```
+查询: "category:玩具"
+域: category
+```
+
+**生成的查询**：
+- 使用所有配置的字段进行搜索（`categoryName`）
+- 不进行多语言路由
+
+## 配置验证
+
+系统会自动验证配置：
+1. 检查 `language_field_mapping` 中引用的字段是否存在
+2. 验证字段类型是否为 `TEXT`
+3. 警告字段分析器与语言不匹配的情况
+
+## API 使用
+
+### 搜索接口
+
+```python
+POST /search/
+{
+    "query": "芭比娃娃",
+    "size": 10,
+    "enable_translation": true,
+    "enable_embedding": true
+}
+```
+
+### 域搜索
+
+```python
+POST /search/
+{
+    "query": "title:芭比娃娃",
+    "size": 10,
+    "enable_translation": true
+}
+```
+
+## 注意事项
+
+1. **翻译服务**：需要配置 DeepL API 密钥才能使用翻译功能
+2. **字段配置**：确保每个语言字段都配置了正确的分词器
+3. **性能考虑**：多语言查询会产生多个子查询，可能略微影响性能
+4. **语言检测**：语言检测的准确性会影响查询路由的效果
+
+## 技术实现
+
+- **MultiLanguageQueryBuilder**: 多语言查询构建器
+- **QueryParser**: 查询解析器，支持语言检测和翻译
+- **ConfigLoader**: 配置加载器，支持 `language_field_mapping` 配置
+- **MappingGenerator**: 映射生成器，确保字段使用正确的分析器
+
+## 未来改进
+
+1. 支持更多语言
+2. 优化翻译缓存机制
+3. 支持自定义语言检测模型
+4. 添加查询性能监控
+
diff --git a/config/config_loader.py b/config/config_loader.py
index 8df15b3..c510377 100644
--- a/config/config_loader.py
+++ b/config/config_loader.py
@@ -27,6 +27,9 @@ class IndexConfig:
     boost: float = 1.0
     example: Optional[str] = None
 
+    # Multi-language field mapping: {"zh": ["name"], "en": ["enSpuName"], "ru": ["ruSkuName"]}
+    language_field_mapping: Optional[Dict[str, List[str]]] = None
+
 
 @dataclass
 class RankingConfig:
@@ -66,8 +69,6 @@ class CustomerConfig:
 
     # Database settings
     mysql_config: Dict[str, Any]
-    main_table: str = "shoplazza_product_sku"
-    extension_table: Optional[str] = None
 
     # Field definitions
     fields: List[FieldConfig]
@@ -86,6 +87,10 @@ class CustomerConfig:
 
     # ES index settings
     es_index_name: str
+
+    # Optional fields with defaults
+    main_table: str = "shoplazza_product_sku"
+    extension_table: Optional[str] = None
     es_settings: Dict[str, Any] = field(default_factory=dict)
 
 
@@ -228,13 +233,17 @@ class ConfigLoader:
         if analyzer_str not in ANALYZER_MAP:
             raise ConfigurationError(f"Unknown analyzer: {analyzer_str}")
 
+        # Parse language field mapping if present
+        language_field_mapping = index_data.get("language_field_mapping")
+
         return IndexConfig(
             name=index_data["name"],
             label=index_data.get("label", index_data["name"]),
             fields=index_data["fields"],
             analyzer=ANALYZER_MAP[analyzer_str],
             boost=index_data.get("boost", 1.0),
-            example=index_data.get("example")
+            example=index_data.get("example"),
+            language_field_mapping=language_field_mapping
         )
 
     def validate_config(self, config: CustomerConfig) -> List[str]:
@@ -251,10 +260,57 @@ class ConfigLoader:
 
         # Validate field references in indexes
         field_names = {field.name for field in config.fields}
+        field_map = {field.name: field for field in config.fields}
+        
         for index in config.indexes:
+            # Validate fields in index.fields
             for field_name in index.fields:
                 if field_name not in field_names:
                     errors.append(f"Index '{index.name}' references unknown field '{field_name}'")
+            
+            # Validate language_field_mapping if present
+            if index.language_field_mapping:
+                for lang, field_list in index.language_field_mapping.items():
+                    if not isinstance(field_list, list):
+                        errors.append(f"Index '{index.name}': language_field_mapping['{lang}'] must be a list")
+                        continue
+                    
+                    for field_name in field_list:
+                        # Check if field exists
+                        if field_name not in field_names:
+                            errors.append(
+                                f"Index '{index.name}': language_field_mapping['{lang}'] "
+                                f"references unknown field '{field_name}'"
+                            )
+                        else:
+                            # Check if field is TEXT type (multi-language fields should be text fields)
+                            field = field_map[field_name]
+                            if field.field_type != FieldType.TEXT:
+                                errors.append(
+                                    f"Index '{index.name}': language_field_mapping['{lang}'] "
+                                    f"field '{field_name}' must be of type TEXT, got {field.field_type.value}"
+                                )
+                            
+                            # Verify analyzer is appropriate for the language
+                            # This is a soft check - we just warn if analyzer doesn't match language
+                            if field.analyzer:
+                                analyzer_name = field.analyzer.value.lower()
+                                expected_analyzers = {
+                                    'zh': ['chinese', 'index_ansj', 'query_ansj'],
+                                    'en': ['english'],
+                                    'ru': ['russian'],
+                                    'ar': ['arabic'],
+                                    'es': ['spanish'],
+                                    'ja': ['japanese']
+                                }
+                                if lang in expected_analyzers:
+                                    expected = expected_analyzers[lang]
+                                    if not any(exp in analyzer_name for exp in expected):
+                                        # Warning only, not an error
+                                        print(
+                                            f"Warning: Index '{index.name}': field '{field_name}' for language '{lang}' "
+                                            f"uses analyzer '{analyzer_name}', which may not be optimal for '{lang}'"
+                                        )
 
         # Validate SPU config
         if config.spu_config.enabled:
@@ -360,11 +416,16 @@ class ConfigLoader:
 
     def _index_to_dict(self, index: IndexConfig) -> Dict[str, Any]:
         """Convert IndexConfig to dictionary."""
-        return {
+        result = {
             "name": index.name,
             "label": index.label,
             "fields": index.fields,
             "analyzer": index.analyzer.value,
             "boost": index.boost,
             "example": index.example
-        }
\ No newline at end of file
+        }
+
+        if index.language_field_mapping:
+            result["language_field_mapping"] = index.language_field_mapping
+
+        return result
\ No newline at end of file
diff --git a/config/schema/customer1_config.yaml b/config/schema/customer1_config.yaml
index bfe2e53..84e9ba1 100644
--- a/config/schema/customer1_config.yaml
+++ b/config/schema/customer1_config.yaml
@@ -177,6 +177,15 @@ indexes:
     analyzer: "chinese_ecommerce"
     boost: 1.0
     example: 'query=default:"消防套"'
+    language_field_mapping:
+      zh:
+        - "name"
+        - "categoryName"
+        - "brandName"
+      en:
+        - "enSpuName"
+      ru:
+        - "ruSkuName"
 
   - name: "title"
     label: "标题索引"
@@ -187,6 +196,13 @@ indexes:
     analyzer: "chinese_ecommerce"
     boost: 2.0
     example: 'query=title:"芭比娃娃"'
+    language_field_mapping:
+      zh:
+        - "name"
+      en:
+        - "enSpuName"
+      ru:
+        - "ruSkuName"
 
   - name: "category"
     label: "类目索引"
diff --git a/query/query_parser.py b/query/query_parser.py
index 56e4bde..2679ce6 100644
--- a/query/query_parser.py
+++ b/query/query_parser.py
@@ -138,9 +138,29 @@ class QueryParser:
         # Stage 4: Translation
         translations = {}
         if self.query_config.enable_translation:
+            # Determine target languages for translation
+            # If domain has language_field_mapping, only translate to languages in the mapping
+            # Otherwise, use all supported languages
+            target_langs_for_translation = self.query_config.supported_languages
+            
+            # Check if domain has language_field_mapping
+            domain_config = next(
+                (idx for idx in self.config.indexes if idx.name == domain),
+                None
+            )
+            if domain_config and domain_config.language_field_mapping:
+                # Only translate to languages that exist in the mapping
+                available_languages = set(domain_config.language_field_mapping.keys())
+                target_langs_for_translation = [
+                    lang for lang in self.query_config.supported_languages
+                    if lang in available_languages
+                ]
+                print(f"[QueryParser] Domain '{domain}' has language_field_mapping, "
+                      f"will translate to: {target_langs_for_translation}")
+            
             target_langs = self.translator.get_translation_needs(
                 detected_lang,
-                self.query_config.supported_languages
+                target_langs_for_translation
             )
 
             if target_langs:
diff --git a/search/multilang_query_builder.py b/search/multilang_query_builder.py
new file mode 100644
index 0000000..7c2387f
--- /dev/null
+++ b/search/multilang_query_builder.py
@@ -0,0 +1,305 @@
+"""
+Multi-language query builder for handling domain-specific searches.
+
+This module extends the ESQueryBuilder to support multi-language field mappings,
+allowing queries to be routed to appropriate language-specific fields while
+maintaining a unified external interface.
+"""
+
+from typing import Dict, Any, List, Optional
+import numpy as np
+
+from config import CustomerConfig, IndexConfig
+from query import ParsedQuery
+from .es_query_builder import ESQueryBuilder
+
+
+class MultiLanguageQueryBuilder(ESQueryBuilder):
+    """
+    Enhanced query builder with multi-language support.
+
+    Handles routing queries to appropriate language-specific fields based on:
+    1. Detected query language
+    2. Available translations
+    3. Domain configuration (language_field_mapping)
+    """
+
+    def __init__(
+        self,
+        config: CustomerConfig,
+        index_name: str,
+        text_embedding_field: Optional[str] = None,
+        image_embedding_field: Optional[str] = None
+    ):
+        """
+        Initialize multi-language query builder.
+
+        Args:
+            config: Customer configuration
+            index_name: ES index name
+            text_embedding_field: Field name for text embeddings
+            image_embedding_field: Field name for image embeddings
+        """
+        self.config = config
+
+        # For default domain, use all fields as fallback
+        default_fields = self._get_domain_fields("default")
+
+        super().__init__(
+            index_name=index_name,
+            match_fields=default_fields,
+            text_embedding_field=text_embedding_field,
+            image_embedding_field=image_embedding_field
+        )
+
+        # Build domain configurations
+        self.domain_configs = self._build_domain_configs()
+
+    def _build_domain_configs(self) -> Dict[str, IndexConfig]:
+        """Build mapping of domain name to IndexConfig."""
+        return {index.name: index for index in self.config.indexes}
+
+    def _get_domain_fields(self, domain_name: str) -> List[str]:
+        """Get fields for a specific domain with boost notation."""
+        for index in self.config.indexes:
+            if index.name == domain_name:
+                result = []
+                for field_name in index.fields:
+                    field = self._get_field_by_name(field_name)
+                    if field and field.boost != 1.0:
+                        result.append(f"{field_name}^{field.boost}")
+                    else:
+                        result.append(field_name)
+                return result
+        return []
+
+    def _get_field_by_name(self, field_name: str):
+        """Get field configuration by name."""
+        for field in self.config.fields:
+            if field.name == field_name:
+                return field
+        return None
+
+    def build_multilang_query(
+        self,
+        parsed_query: ParsedQuery,
+        query_vector: Optional[np.ndarray] = None,
+        filters: Optional[Dict[str, Any]] = None,
+        size: int = 10,
+        from_: int = 0,
+        enable_knn: bool = True,
+        knn_k: int = 50,
+        knn_num_candidates: int = 200,
+        min_score: Optional[float] = None
+    ) -> Dict[str, Any]:
+        """
+        Build ES query with multi-language support.
+
+        Args:
+            parsed_query: Parsed query with language info and translations
+            query_vector: Query embedding for KNN search
+            filters: Additional filters
+            size: Number of results
+            from_: Offset for pagination
+            enable_knn: Whether to use KNN search
+            knn_k: K value for KNN
+            knn_num_candidates: Number of candidates for KNN
+            min_score: Minimum score threshold
+
+        Returns:
+            ES query DSL dictionary
+        """
+        domain = parsed_query.domain
+        domain_config = self.domain_configs.get(domain)
+
+        if not domain_config:
+            # Fallback to default domain
+            domain = "default"
+            domain_config = self.domain_configs.get("default")
+
+        if not domain_config:
+            # Use original behavior
+            return super().build_query(
+                query_text=parsed_query.rewritten_query,
+                query_vector=query_vector,
+                filters=filters,
+                size=size,
+                from_=from_,
+                enable_knn=enable_knn,
+                knn_k=knn_k,
+                knn_num_candidates=knn_num_candidates,
+                min_score=min_score
+            )
+
+        print(f"[MultiLangQueryBuilder] Building query for domain: {domain}")
+        print(f"[MultiLangQueryBuilder] Detected language: {parsed_query.detected_language}")
+        print(f"[MultiLangQueryBuilder] Available translations: {list(parsed_query.translations.keys())}")
+
+        # Build query clause with multi-language support
+        query_clause = self._build_multilang_text_query(parsed_query, domain_config)
+
+        es_query = {
+            "size": size,
+            "from": from_
+        }
+
+        # Add filters if provided
+        if filters:
+            es_query["query"] = {
+                "bool": {
+                    "must": [query_clause],
+                    "filter": self._build_filters(filters)
+                }
+            }
+        else:
+            es_query["query"] = query_clause
+
+        # Add KNN search if enabled and vector provided
+        if enable_knn and query_vector is not None and self.text_embedding_field:
+            knn_clause = {
+                "field": self.text_embedding_field,
+                "query_vector": query_vector.tolist(),
+                "k": knn_k,
+                "num_candidates": knn_num_candidates
+            }
+            es_query["knn"] = knn_clause
+
+        # Add minimum score filter
+        if min_score is not None:
+            es_query["min_score"] = min_score
+
+        return es_query
+
+    def _build_multilang_text_query(
+        self,
+        parsed_query: ParsedQuery,
+        domain_config: IndexConfig
+    ) -> Dict[str, Any]:
+        """
+        Build text query with multi-language field routing.
+
+        Args:
+            parsed_query: Parsed query with language info
+            domain_config: Domain configuration
+
+        Returns:
+            ES query clause
+        """
+        if not domain_config.language_field_mapping:
+            # No multi-language mapping, use all fields with default analyzer
+            fields_with_boost = []
+            for field_name in domain_config.fields:
+                field = self._get_field_by_name(field_name)
+                if field and field.boost != 1.0:
+                    fields_with_boost.append(f"{field_name}^{field.boost}")
+                else:
+                    fields_with_boost.append(field_name)
+
+            return {
+                "multi_match": {
+                    "query": parsed_query.rewritten_query,
+                    "fields": fields_with_boost,
+                    "minimum_should_match": "67%",
+                    "tie_breaker": 0.9,
+                    "boost": domain_config.boost,
+                    "_name": f"{domain_config.name}_query"
+                }
+            }
+
+        # Multi-language mapping exists - build targeted queries
+        should_clauses = []
+        available_languages = set(domain_config.language_field_mapping.keys())
+
+        # 1. Query in detected language (if it exists in mapping)
+        detected_lang = parsed_query.detected_language
+        if detected_lang in available_languages:
+            target_fields = domain_config.language_field_mapping[detected_lang]
+            fields_with_boost = self._apply_field_boosts(target_fields)
+
+            should_clauses.append({
+                "multi_match": {
+                    "query": parsed_query.rewritten_query,
+                    "fields": fields_with_boost,
+                    "minimum_should_match": "67%",
+                    "tie_breaker": 0.9,
+                    "boost": domain_config.boost * 1.5,  # Higher boost for detected language
+                    "_name": f"{domain_config.name}_{detected_lang}_query"
+                }
+            })
+            print(f"[MultiLangQueryBuilder] Added query for detected language '{detected_lang}' on fields: {target_fields}")
+
+        # 2. Query in translated languages (only for languages in mapping)
+        for lang, translation in parsed_query.translations.items():
+            # Only use translations for languages that exist in the mapping
+            if lang in available_languages and translation and translation.strip():
+                target_fields = domain_config.language_field_mapping[lang]
+                fields_with_boost = self._apply_field_boosts(target_fields)
+
+                should_clauses.append({
+                    "multi_match": {
+                        "query": translation,
+                        "fields": fields_with_boost,
+                        "minimum_should_match": "67%",
+                        "tie_breaker": 0.9,
+                        "boost": domain_config.boost,
+                        "_name": f"{domain_config.name}_{lang}_translated_query"
+                    }
+                })
+                print(f"[MultiLangQueryBuilder] Added translated query for language '{lang}' on fields: {target_fields}")
+
+        # 3. Fallback: query all fields in mapping if no language-specific query was built
+        if not should_clauses:
+            print(f"[MultiLangQueryBuilder] No language mapping matched, using all fields from mapping")
+            # Use all fields from all languages in the mapping
+            all_mapped_fields = []
+            for lang_fields in domain_config.language_field_mapping.values():
+                all_mapped_fields.extend(lang_fields)
+            # Remove duplicates while preserving order
+            unique_fields = list(dict.fromkeys(all_mapped_fields))
+            fields_with_boost = self._apply_field_boosts(unique_fields)
+
+            should_clauses.append({
+                "multi_match": {
+                    "query": parsed_query.rewritten_query,
+                    "fields": fields_with_boost,
+                    "minimum_should_match": "67%",
+                    "tie_breaker": 0.9,
+                    "boost": domain_config.boost * 0.8,  # Lower boost for fallback
+                    "_name": f"{domain_config.name}_fallback_query"
+                }
+            })
+
+        if len(should_clauses) == 1:
+            return should_clauses[0]
+        else:
+            return {
+                "bool": {
+                    "should": should_clauses,
+                    "minimum_should_match": 1
+                }
+            }
+
+    def _apply_field_boosts(self, field_names: List[str]) -> List[str]:
+        """Apply boost values to field names."""
+        result = []
+        for field_name in field_names:
+            field = self._get_field_by_name(field_name)
+            if field and field.boost != 1.0:
+                result.append(f"{field_name}^{field.boost}")
+            else:
+                result.append(field_name)
+        return result
+
+    def get_domain_summary(self) -> Dict[str, Any]:
+        """Get summary of all configured domains."""
+        summary = {}
+        for domain_name, domain_config in self.domain_configs.items():
+            summary[domain_name] = {
+                "label": domain_config.label,
+                "fields": domain_config.fields,
+                "analyzer": domain_config.analyzer.value,
+                "boost": domain_config.boost,
+                "has_multilang_mapping": domain_config.language_field_mapping is not None,
+                "supported_languages": list(domain_config.language_field_mapping.keys()) if domain_config.language_field_mapping else []
+            }
+        return summary
\ No newline at end of file
diff --git a/search/searcher.py b/search/searcher.py
index a7088ec..0a798ed 100644
--- a/search/searcher.py
+++ b/search/searcher.py
@@ -13,6 +13,7 @@ from query import QueryParser, ParsedQuery
 from indexer import MappingGenerator
 from .boolean_parser import BooleanParser, QueryNode
 from .es_query_builder import ESQueryBuilder
+from .multilang_query_builder import MultiLanguageQueryBuilder
 from .ranking_engine import RankingEngine
 
 
@@ -86,10 +87,10 @@ class Searcher:
         self.text_embedding_field = mapping_gen.get_text_embedding_field()
         self.image_embedding_field = mapping_gen.get_image_embedding_field()
 
-        # Query builder
-        self.query_builder = ESQueryBuilder(
+        # Query builder - use multi-language version
+        self.query_builder = MultiLanguageQueryBuilder(
+            config=config,
             index_name=config.es_index_name,
-            match_fields=self.match_fields,
             text_embedding_field=self.text_embedding_field,
             image_embedding_field=self.image_embedding_field
         )
@@ -144,11 +145,10 @@ class Searcher:
             query_text = parsed_query.rewritten_query
             print(f"[Searcher] Parsed boolean expression: {query_node}")
 
-        # Step 3: Build ES query
-        es_query = self.query_builder.build_query(
-            query_text=query_text,
+        # Step 3: Build ES query using multi-language builder
+        es_query = self.query_builder.build_multilang_query(
+            parsed_query=parsed_query,
             query_vector=parsed_query.query_vector if enable_embedding else None,
-            query_node=query_node,
             filters=filters,
             size=size,
             from_=from_,
@@ -325,6 +325,15 @@ class Searcher:
             query_info={'image_url': image_url, 'search_type': 'image_similarity'}
         )
 
+    def get_domain_summary(self) -> Dict[str, Any]:
+        """
+        Get summary of all configured domains.
+
+        Returns:
+            Dictionary with domain information
+        """
+        return self.query_builder.get_domain_summary()
+
     def get_document(self, doc_id: str) -> Optional[Dict[str, Any]]:
         """
         Get single document by ID.
diff --git a/test_multilang_config.py b/test_multilang_config.py
new file mode 100644
index 0000000..8452ddb
--- /dev/null
+++ b/test_multilang_config.py
@@ -0,0 +1,155 @@
+#!/usr/bin/env python3
+"""
+Test script to validate multi-language configuration.
+
+This script validates that:
+1. language_field_mapping is correctly loaded from config
+2. All referenced fields exist and have correct analyzers
+3. Multi-language query builder works correctly
+"""
+
+import sys
+import json
+from config import ConfigLoader
+
+def test_config_loading():
+    """Test that configuration loads correctly with language_field_mapping."""
+    print("=" * 60)
+    print("Testing Configuration Loading")
+    print("=" * 60)
+    
+    try:
+        loader = ConfigLoader()
+        config = loader.load_customer_config('customer1')
+        
+        print(f"\n✓ Configuration loaded successfully")
+        print(f"  Customer: {config.customer_name}")
+        print(f"  ES Index: {config.es_index_name}")
+        
+        # Validate configuration
+        errors = loader.validate_config(config)
+        if errors:
+            print(f"\n✗ Configuration validation failed:")
+            for error in errors:
+                print(f"  - {error}")
+            return False
+        else:
+            print(f"\n✓ Configuration validation passed")
+        
+        # Check indexes with language_field_mapping
+        print(f"\nIndexes with multi-language support:")
+        for index in config.indexes:
+            if index.language_field_mapping:
+                print(f"\n  {index.name} ({index.label}):")
+                print(f"    Fields: {index.fields}")
+                print(f"    Language mapping:")
+                for lang, fields in index.language_field_mapping.items():
+                    print(f"      {lang}: {fields}")
+            else:
+                print(f"\n  {index.name} ({index.label}): No language mapping")
+        
+        return True
+        
+    except Exception as e:
+        print(f"\n✗ Error loading configuration: {e}")
+        import traceback
+        traceback.print_exc()
+        return False
+
+
+def test_multilang_query_builder():
+    """Test that MultiLanguageQueryBuilder works correctly."""
+    print("\n" + "=" * 60)
+    print("Testing Multi-Language Query Builder")
+    print("=" * 60)
+    
+    try:
+        from config import ConfigLoader
+        from query import QueryParser
+        from search.multilang_query_builder import MultiLanguageQueryBuilder
+        from indexer import MappingGenerator
+        
+        loader = ConfigLoader()
+        config = loader.load_customer_config('customer1')
+        
+        # Initialize query builder
+        mapping_gen = MappingGenerator(config)
+        text_embedding_field = mapping_gen.get_text_embedding_field()
+        image_embedding_field = mapping_gen.get_image_embedding_field()
+        
+        query_builder = MultiLanguageQueryBuilder(
+            config=config,
+            index_name=config.es_index_name,
+            text_embedding_field=text_embedding_field,
+            image_embedding_field=image_embedding_field
+        )
+        
+        print(f"\n✓ MultiLanguageQueryBuilder initialized")
+        
+        # Get domain summary
+        summary = query_builder.get_domain_summary()
+        print(f"\nDomain Summary:")
+        for domain, info in summary.items():
+            print(f"  {domain}:")
+            print(f"    Label: {info['label']}")
+            print(f"    Has multilang mapping: {info['has_multilang_mapping']}")
+            if info['has_multilang_mapping']:
+                print(f"    Supported languages: {info['supported_languages']}")
+        
+        # Test query parsing
+        query_parser = QueryParser(config)
+        test_queries = [
+            "芭比娃娃",
+            "title:芭比娃娃",
+            "default:玩具"
+        ]
+        
+        print(f"\nTesting query parsing:")
+        for query in test_queries:
+            print(f"\n  Query: '{query}'")
+            parsed = query_parser.parse(query, generate_vector=False)
+            print(f"    Domain: {parsed.domain}")
+            print(f"    Detected language: {parsed.detected_language}")
+            print(f"    Translations: {list(parsed.translations.keys())}")
+            
+            # Build query
+            es_query = query_builder.build_multilang_query(
+                parsed_query=parsed,
+                query_vector=None,
+                filters=None,
+                size=10,
+                enable_knn=False
+            )
+            print(f"    ES Query keys: {list(es_query.keys())}")
+        
+        return True
+        
+    except Exception as e:
+        print(f"\n✗ Error testing query builder: {e}")
+        import traceback
+        traceback.print_exc()
+        return False
+
+
+if __name__ == "__main__":
+    print("Multi-Language Configuration Test")
+    print("=" * 60)
+    
+    success = True
+    
+    # Test 1: Configuration loading
+    if not test_config_loading():
+        success = False
+    
+    # Test 2: Multi-language query builder
+    if not test_multilang_query_builder():
+        success = False
+    
+    print("\n" + "=" * 60)
+    if success:
+        print("✓ All tests passed!")
+        sys.exit(0)
+    else:
+        print("✗ Some tests failed")
+        sys.exit(1)
+
diff --git a/当前开发进度.md b/当前开发进度.md
new file mode 100644
index 0000000..0d3fcbd
--- /dev/null
+++ b/当前开发进度.md
@@ -0,0 +1,53 @@
+
+
+对后端搜索技术 做通用化。
+
+通用化的本质 是 对于各种业务数据、各种检索需求，都可以  用少量定制+配置化 来实现效果。
+
+## 1. 原始数据层的约定。
+### 店匠主表
+shoplazza_product_sku
+shoplazza_product_spu
+所有租户共用这个主表
+
+### 每个租户的辅表
+各个租户，有自己的扩展表。 入索引的时候，商品主表 shoplazza_product_sku 的 id + shopid，拼接租户自己单独的扩展表（比如可以放一些自己的属性体系、各种语言的商品名、品牌名、标签、分类等）
+
+但是，各个租户，可能有不一样的业务数据，比如不同租户有不同的属性的体系、不同语言的商品标题（一般至少有中英文两种满足跨境的搜索需求），有不同的权重（提权）字段、业务过滤和聚合字段。
+能够统一的 只能是 sku表 按照一套配置规范、做一个配置文件，按照配置文件建设ES mapping结构以及做数据的入库。
+
+1. 应用结构配置 ： 定义了ES的输入数据有哪些字段、关联mysql的哪些字段.
+ 请帮我补充具体实现的一些配置
+
+
+2。 索引结构配置 : 定义了ES的字段，每个字段的索引mapping配置，支持各个域的查询，包括默认的域的查询。索引配置预定一号了一堆分析方式
+ 请帮我补充具体实现的一些配置
+
+## 测试数据灌入
+
+灌入数据、mysql到ES的自动同步，不在本项目的范围内，但是，该项目 为了提供测试数据，需要 构造一个实例 customer1.
+我们为他构造一套应用配置和索引配置。
+暂时是随机抽了我们自己的1w数据，建设辅助表，然后写一个程序，将数据分别灌入主表和辅表。
+
+请帮我补充具体，当前测试数据灌入的具体的配置和方式，比如辅助表的内容 对应的应用结构配置 索引配置 等等。
+
+## queryParser
+
+1. 查询改写。 配置词典的key是query，value是改写后的查询表达式，比如。比如品牌词 改写为在brand|query OR name|query，类别词、标签词等都可以放进去。纠错、规范化、查询改写等 都可以通过这个词典来配置。
+2. 翻译。配置需要得到的几种目标语言。 在customer1测试案例中，我们配置 zh en两种语言。先对query做语言检测，如果query是中文那么要翻译一下en，如果是en那么要翻译zh，如果两者都不是那么zh en都需要翻译。
+3. 如果配置打开了text_embedding查询，并且query 包含了default域的查询，那么要把default域的查询词转向量，后面searcher会用这个向量参与查询。
+
+也帮我补充一些具体实现情况
+
+## searcher
+
+支持多种检索表达式：
+支持多种匹配方式，如AND、OR、RANK、NOTAND以及()，优先级从高到低为()，ANDNOT，AND，OR，RANK。
+
+## default域的相关性，是代码里面单独计算，是特定的深度定制优化的，暂时不做配置化。
+
+暂时具体实现为 bm25()+0.2*text_embedding_relevence（也就是knn检索表达式的打分）
+bm25() 包括多语言的打分：内部需要通过配置翻译为多种语言（配置几种目标语言 默认中文、英文，并且设置对应的检索域），然后分别到对应的字段搜索，中文字段到配置的中文title搜索，英文到对应的英文title搜索。
+
+也帮我补充一些具体实现情况
+
diff --git a/支持多语言查询.md b/支持多语言查询.md
new file mode 100644
index 0000000..fe93dea
--- /dev/null
+++ b/支持多语言查询.md
@@ -0,0 +1,196 @@
+
+
+
+
+这次修改没改完。
+
+
+diff --git a/HighLevelDesign.md b/HighLevelDesign.md
+index 397a9f7..3e728c9 100644
+--- a/HighLevelDesign.md
++++ b/HighLevelDesign.md
+@@ -112,10 +112,9 @@ if response.status_code == 200:
+ 支持多种匹配方式，如AND、OR、RANK、NOTAND以及()，优先级从高到低为()，ANDNOT，AND，OR，RANK。
+ 
+ default域的相关性，是代码里面单独计算，是特定的深度定制优化的，暂时不做配置化。
+-多语言搜索：
+-对外提供的服务 用default域搜索就行，但是内部需要通过配置翻译为多种语言（配置几种目标语言 默认中文、英文，并且设置对应的检索域），然后分别到对应的字段搜索，中文字段到配置的中文title搜索，英文到对应的英文title搜索。
+ 
+ 暂时具体实现为 bm25()+0.2*text_embedding_relevence（也就是knn检索表达式的打分）
++bm25() 包括多语言的打分：内部需要通过配置翻译为多种语言（配置几种目标语言 默认中文、英文，并且设置对应的检索域），然后分别到对应的字段搜索，中文字段到配置的中文title搜索，英文到对应的英文title搜索。
+ bm25打分（base_query）：
+ "multi_match": {
+     "query": search_query,
+diff --git a/config/config_loader.py b/config/config_loader.py
+index 8df15b3..f3fcaa3 100644
+--- a/config/config_loader.py
++++ b/config/config_loader.py
+@@ -27,6 +27,9 @@ class IndexConfig:
+     boost: float = 1.0
+     example: Optional[str] = None
+ 
++    # Multi-language field mapping: {"zh": ["name"], "en": ["enSpuName"], "ru": ["ruSkuName"]}
++    language_field_mapping: Optional[Dict[str, List[str]]] = None
++
+ 
+ @dataclass
+ class RankingConfig:
+@@ -66,8 +69,6 @@ class CustomerConfig:
+ 
+     # Database settings
+     mysql_config: Dict[str, Any]
+-    main_table: str = "shoplazza_product_sku"
+-    extension_table: Optional[str] = None
+ 
+     # Field definitions
+     fields: List[FieldConfig]
+@@ -86,6 +87,10 @@ class CustomerConfig:
+ 
+     # ES index settings
+     es_index_name: str
++
++    # Optional fields with defaults
++    main_table: str = "shoplazza_product_sku"
++    extension_table: Optional[str] = None
+     es_settings: Dict[str, Any] = field(default_factory=dict)
+ 
+ 
+@@ -228,13 +233,17 @@ class ConfigLoader:
+         if analyzer_str not in ANALYZER_MAP:
+             raise ConfigurationError(f"Unknown analyzer: {analyzer_str}")
+ 
++        # Parse language field mapping if present
++        language_field_mapping = index_data.get("language_field_mapping")
++
+         return IndexConfig(
+             name=index_data["name"],
+             label=index_data.get("label", index_data["name"]),
+             fields=index_data["fields"],
+             analyzer=ANALYZER_MAP[analyzer_str],
+             boost=index_data.get("boost", 1.0),
+-            example=index_data.get("example")
++            example=index_data.get("example"),
++            language_field_mapping=language_field_mapping
+         )
+ 
+     def validate_config(self, config: CustomerConfig) -> List[str]:
+@@ -360,11 +369,16 @@ class ConfigLoader:
+ 
+     def _index_to_dict(self, index: IndexConfig) -> Dict[str, Any]:
+         """Convert IndexConfig to dictionary."""
+-        return {
++        result = {
+             "name": index.name,
+             "label": index.label,
+             "fields": index.fields,
+             "analyzer": index.analyzer.value,
+             "boost": index.boost,
+             "example": index.example
+-        }
+\ No newline at end of file
++        }
++
++        if index.language_field_mapping:
++            result["language_field_mapping"] = index.language_field_mapping
++
++        return result
+\ No newline at end of file
+diff --git a/config/schema/customer1_config.yaml b/config/schema/customer1_config.yaml
+index bfe2e53..84e9ba1 100644
+--- a/config/schema/customer1_config.yaml
++++ b/config/schema/customer1_config.yaml
+@@ -177,6 +177,15 @@ indexes:
+     analyzer: "chinese_ecommerce"
+     boost: 1.0
+     example: 'query=default:"消防套"'
++    language_field_mapping:
++      zh:
++        - "name"
++        - "categoryName"
++        - "brandName"
++      en:
++        - "enSpuName"
++      ru:
++        - "ruSkuName"
+ 
+   - name: "title"
+     label: "标题索引"
+@@ -187,6 +196,13 @@ indexes:
+     analyzer: "chinese_ecommerce"
+     boost: 2.0
+     example: 'query=title:"芭比娃娃"'
++    language_field_mapping:
++      zh:
++        - "name"
++      en:
++        - "enSpuName"
++      ru:
++        - "ruSkuName"
+ 
+   - name: "category"
+     label: "类目索引"
+diff --git a/search/searcher.py b/search/searcher.py
+index a7088ec..0a798ed 100644
+--- a/search/searcher.py
++++ b/search/searcher.py
+@@ -13,6 +13,7 @@ from query import QueryParser, ParsedQuery
+ from indexer import MappingGenerator
+ from .boolean_parser import BooleanParser, QueryNode
+ from .es_query_builder import ESQueryBuilder
++from .multilang_query_builder import MultiLanguageQueryBuilder
+ from .ranking_engine import RankingEngine
+ 
+ 
+@@ -86,10 +87,10 @@ class Searcher:
+         self.text_embedding_field = mapping_gen.get_text_embedding_field()
+         self.image_embedding_field = mapping_gen.get_image_embedding_field()
+ 
+-        # Query builder
+-        self.query_builder = ESQueryBuilder(
++        # Query builder - use multi-language version
++        self.query_builder = MultiLanguageQueryBuilder(
++            config=config,
+             index_name=config.es_index_name,
+-            match_fields=self.match_fields,
+             text_embedding_field=self.text_embedding_field,
+             image_embedding_field=self.image_embedding_field
+         )
+@@ -144,11 +145,10 @@ class Searcher:
+             query_text = parsed_query.rewritten_query
+             print(f"[Searcher] Parsed boolean expression: {query_node}")
+ 
+-        # Step 3: Build ES query
+-        es_query = self.query_builder.build_query(
+-            query_text=query_text,
++        # Step 3: Build ES query using multi-language builder
++        es_query = self.query_builder.build_multilang_query(
++            parsed_query=parsed_query,
+             query_vector=parsed_query.query_vector if enable_embedding else None,
+-            query_node=query_node,
+             filters=filters,
+             size=size,
+             from_=from_,
+@@ -325,6 +325,15 @@ class Searcher:
+             query_info={'image_url': image_url, 'search_type': 'image_similarity'}
+         )
+ 
++    def get_domain_summary(self) -> Dict[str, Any]:
++        """
++        Get summary of all configured domains.
++
++        Returns:
++            Dictionary with domain information
++        """
++        return self.query_builder.get_domain_summary()
++
+     def get_document(self, doc_id: str) -> Optional[Dict[str, Any]]:
+         """
+         Get single document by ID.
+
+
+
+
+
+
+
+
--
libgit2 0.21.2