功能简介

混合检索（Hybrid Search）是天翼云云搜索服务的核心增强功能，支持在同一查询中​​同时执行关键词检索（BM25）和向量相似度搜索​​。该能力通过融合传统搜索的精准匹配与AI模型的向量化能力，显著提升复杂场景的搜索质量，尤其适用于电商搜索、内容推荐、多模态搜索等需兼顾文本相关性与语义相似性的场景。

使用示例

删除旧索引

DELETE /hybrid-products

创建新索引

1分片0副本 + 8维向量

PUT /hybrid-products
{
  "settings": {
    "index": {
      "knn": true,
      "knn.algo_param.ef_search": 200,
      "number_of_shards": 1,
      "number_of_replicas": 0
    }
  },
  "mappings": {
    "properties": {
      "product_id": { "type": "keyword" },
      "title": { 
        "type": "text",
        "analyzer": "ik_max_word"
      },
      "feature_vector": { 
        "type": "knn_vector", 
        "dimension": 8
      },
      "price": { "type": "float" }
    }
  }
}

插入数据

新增三条产品数据

POST /hybrid-products/_doc/101
{
  "product_id": "P12345",
  "title": "金属便携咖啡杯",
  "feature_vector": [0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.78, 0.89],
  "price": 89.9
}
POST /hybrid-products/_doc/102
{
  "product_id": "P22357",
  "title": "不锈钢保温杯带茶隔",
  "feature_vector": [0.09, 0.21, 0.37, 0.48, 0.51, 0.62, 0.74, 0.81],
  "price": 69.0
}
POST /hybrid-products/_doc/103
{
  "product_id": "P33489",
  "title": "陶瓷茶杯礼盒装",
  "feature_vector": [0.33, 0.44, 0.55, 0.66, 0.77, 0.88, 0.99, 0.10],
  "price": 129.9
} 

执行混合检索查询

POST /hybrid-products/_search?pretty
{
  "size": 1,
  "query": {
    "hybrid": {
      "queries": [
        {
          "match": {
            "title": {
              "query": "不锈钢保温杯",
              "boost": 0.8
            }
          }
        },
        {
          "knn": {
            "feature_vector": {
              "vector": [0.12, 0.23, 0.34, 0.45, 0.56, 0.67, 0.78, 0.89],
              "k": 50,
              "boost": 1.2
            }
          }
        }
      ]
    }
  },
  "_source": ["product_id", "title", "price"]
}

混合检索查询结果示例

{
  "took" : 253,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : 3.6675835,
    "hits" : [
      {
        "_index" : "hybrid-products",
        "_id" : "102",
        "_score" : -9.549512E9,
        "_source" : {
          "price" : 69.0,
          "product_id" : "P22357",
          "title" : "不锈钢保温杯带茶隔"
        }
      }
    ]
  }
}