析取最大查询 #

析取最大（ dis_max ）查询返回与一个或多个查询子句匹配的任何文档。对于与多个查询子句匹配的文档，相关性得分设置为所有匹配查询子句中的最高相关性得分。

当返回的文档的相关性分数相同时，您可以使用 tie_breaker 参数来增加匹配多个查询子句的文档的权重。

参考样例 #

考虑一个包含两个文档的索引，您按照以下方式索引这些文档：

PUT testindex1/_doc/1
{
  "title": " The Top 10 Shakespeare Poems",
  "description": "Top 10 sonnets of England's national poet and the Bard of Avon"
}

PUT testindex1/_doc/2
{
  "title": "Sonnets of the 16th Century",
  "body": "The poems written by various 16-th century poets"
}

使用 dis_max 查询来搜索包含单词“莎士比亚诗歌”的文档

GET testindex1/_search
{
  "query": {
    "dis_max": {
      "queries": [
        { "match": { "title": "Shakespeare poems" }},
        { "match": { "body":  "Shakespeare poems" }}
      ]
    }
  }
}

返回内容包含两个文档：

{
  "took": 8,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 2,
      "relation": "eq"
    },
    "max_score": 1.3862942,
    "hits": [
      {
        "_index": "testindex1",
        "_id": "1",
        "_score": 1.3862942,
        "_source": {
          "title": " The Top 10 Shakespeare Poems",
          "description": "Top 10 sonnets of England's national poet and the Bard of Avon"
        }
      },
      {
        "_index": "testindex1",
        "_id": "2",
        "_score": 0.2876821,
        "_source": {
          "title": "Sonnets of the 16th Century",
          "body": "The poems written by various 16-th century poets"
        }
      }
    ]
  }
}

参数说明 #

以下表格列出了所有由 dis_max 查询支持的一级参数。