Elasticsearch 实战Query DSL搜索语法

Elasticsearch实战

本课时主要介绍以下三种语法

must 必须满足；

should 如果包含了must或者filter查询，那么should的查询语句就不是或者的意思了,而是有或者没有都行的含义；使用minimum_should_match，至少匹配一项should子句；

must_not 必须不满足；

step1

准备三条介绍技术的文档

POST /technology/type/_bulk
{"index":{"_id":1}}
{"title":"ES搜索引擎","content":"Elasticsearch是一个基于Lucene的搜索服务器。","creator":"Lucene","cost":60}
{"index":{"_id":2}}
{"title":"Solr搜索引擎","content":"Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器","creator":"Lucene","cost":20}
{"index":{"_id":3}}
{"title":"RocketMQ","content":"消息队列 RocketMQ 版（原ONS）是阿里云基于 Apache RocketMQ构建的低延迟、高并发、高可用、高可靠的分布式消息中间件。","creator":"Alibaba","cost":30}

step2

需求查询‘’搜索引擎“，内容可以包含“消息队列”也可以不包含，不可以来自Alibaba

GET /technology/type/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "搜索引擎"
          }
        }
      ],
      "should": [
        {
          "match": {
            "content": "消息队列"
          }
        }
      ],
      "must_not": [
        {
          "match": {
            "creator": "Alibaba"
          }
        }
      ]
    }
  }
}

#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
  "took" : 530,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 2,
      "relation" : "eq"
    },
    "max_score" : 1.6365592,
    "hits" : [
      {
        "_index" : "technology",
        "_type" : "type",
        "_id" : "1",
        "_score" : 1.6365592,
        "_source" : {
          "title" : "ES搜索引擎",
          "content" : "Elasticsearch是一个基于Lucene的搜索服务器。",
          "creator" : "Lucene",
          "cost" : 60
        }
      },
      {
        "_index" : "technology",
        "_type" : "type",
        "_id" : "2",
        "_score" : 1.6365592,
        "_source" : {
          "title" : "Solr搜索引擎",
          "content" : "Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器",
          "creator" : "Lucene",
          "cost" : 20
        }
      }
    ]
  }
}
 

step3

使用"minimum_should_match": 1

GET /technology/type/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "搜索引擎"
          }
        }
      ],
      "should": [
        {
          "match": {
            "content": "消息队列"
          }
        }
      ],
      "must_not": [
        {
          "match": {
            "creator": "Alibaba"
          }
        }
      ],
      "minimum_should_match": 1
    }
  }
}

#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  }
}

step4

没有must或者filter查询表示或

GET /technology/type/_search
{
  "query": {
    "bool": {
      
      "should": [
        {
          "match": {
            "creator": "Lucene"
          }
        },
        {
          "match": {
            "title": "RocketMQ"
          }
        }
      ]
    }
  }
}

#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3,
      "relation" : "eq"
    },
    "max_score" : 1.3962393,
    "hits" : [
      {
        "_index" : "technology",
        "_type" : "type",
        "_id" : "3",
        "_score" : 1.3962393,
        "_source" : {
          "title" : "RocketMQ",
          "content" : "消息队列 RocketMQ 版（原ONS）是阿里云基于 Apache RocketMQ构建的低延迟、高并发、高可用、高可靠的分布式消息中间件。",
          "creator" : "Alibaba",
          "cost" : 30
        }
      },
      {
        "_index" : "technology",
        "_type" : "type",
        "_id" : "1",
        "_score" : 0.4700036,
        "_source" : {
          "title" : "ES搜索引擎",
          "content" : "Elasticsearch是一个基于Lucene的搜索服务器。",
          "creator" : "Lucene",
          "cost" : 60
        }
      },
      {
        "_index" : "technology",
        "_type" : "type",
        "_id" : "2",
        "_score" : 0.4700036,
        "_source" : {
          "title" : "Solr搜索引擎",
          "content" : "Solr是一个高性能，采用Java开发，基于Lucene的全文搜索服务器",
          "creator" : "Lucene",
          "cost" : 20
        }
      }
    ]
  }
}
 

step5

GET /technology/type/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "match": {
            "creator": "Lucene"
          }
        },
        {
          "match": {
            "title": "RocketMQ"
          }
        }
      ],
      "minimum_should_match": 2
    }
  }
}

#! Deprecation: [types removal] Specifying types in search requests is deprecated.
{
  "took" : 0,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  }
}
 

 

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