ElasticSearch多词查询，匹配多个词比匹配少而多更有价值

Question

我在 ElasticSearch 中写了一个多词搜索查询，匹配多个词比匹配 1 更有价值但很多次。

跨几个字段的 1 个查询：

{
      "bool" : {
        "must" : [
          {
            "simple_query_string" : {
              "query" : "effective date ",
              "fields" : [
                "field1^1.0",
                "field2^5.0",
                "field3^10.0",
              ],
              "flags" : -1,
              "default_operator" : "or",
              "analyze_wildcard" : false,
              "auto_generate_synonyms_phrase_query" : true,
              "fuzzy_prefix_length" : 0,
              "fuzzy_max_expansions" : 50,
              "fuzzy_transpositions" : true,
              "boost" : 1.0
            }
          }
        ],
        "adjust_pure_negative" : true,
        "boost" : 1.0
      }
    }

当我搜索“生效或日期”时

例如：

“这是有效计算问题的示例日期”

应该得分高于：

“date date date是他对孩子们说的”

我怎样才能为此微调弹性搜索？

谢谢！

Answer 1

由于你在问题中没有提到你索引了多少个字段，所以我只取了一个字段，即title

索引文档：

{
    "title":"This is an example date for effective calculation of the problems"

}
{
    "title":"date date date is what he said to the children"

}

搜索查询：

{
  "query": {
    "bool": {
      "must": [
        {
          "multi_match": {
            "query": "effective date",
            "operator": "or",
            "fields": [
             "title"                    --> If you have more fields, you can 
                                            add them here
            ]
          }
        }
      ]
    }
  }
}

搜索结果：

"hits": [
        {
            "_index": "my_index",
            "_type": "_doc",
            "_id": "1",
            "_score": 0.85874003,
            "_source": {
                "title": "This is an example date for effective calculation of the problems"
            }
        },
        {
            "_index": "my_index",
            "_type": "_doc",
            "_id": "2",
            "_score": 0.289459,
            "_source": {
                "title": "date date date is what he said to the children"
            }
        }
    ]

关于Multi-Match查询的详细说明，可以参考这个官方documentation

更新 1：

使用查询字符串

    {
  "query": {
    "query_string": {
      "default_field": "title",
      "query": "effective OR date"
    }
  }
}

查询字符串的详细解释可以参考this

更新 2：

使用 simple_query_string

{
  "query": {
    "simple_query_string" : {
        "query": "effective date",
        "fields": ["title"],
        "default_operator": "or"
    }
  }
}

以上三个搜索查询全部使用，得到相同的搜索结果，_score没有区别