es 基础概念总结 —— Request Body Search

Posted 2021-03-04 lemos

一、query DSL

叶子查询

于特定字段查询特定值。如 match, term 或 range 查询

复合查询

包装其它叶子查询或复合查询。如使用 bool or dis_max 混合多个查询

 

分离最大化查询 dis_max

分离最大化查询（Disjunction Max Query）指的是： 将任何与任一查询匹配的文档作为结果返回，但只将最佳匹配的评分作为查询的评分结果返回，而不是将所有匹配结果的得分相加。

示例：

{
    "query": {
        "dis_max": {
            "queries": [
                { "match": { "title": "Brown fox" }},
                { "match": { "body":  "Brown fox" }}
            ]
        }
    }
}

 返回

{
  "hits": [
     {
        "_id":      "2",
        "_score":   0.21509302,
        "_source": {
           "title": "Keeping pets healthy",
           "body":  "My quick brown fox eats rabbits on a regular basis."
        }
     },
     {
        "_id":      "1",
        "_score":   0.12713557,
        "_source": {
           "title": "Quick brown rabbits",
           "body":  "Brown rabbits are commonly seen."
        }
     }
  ]
}

 

参考文档

---

https://www.elastic.co/guide/cn/elasticsearch/guide/current/_best_fields.html

https://www.elastic.co/guide/cn/elasticsearch/guide/current/_tuning_best_fields_queries.html