ElasticSearch学习

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来源：https://blog.csdn.net/ywl470812087/category_9621251.html

ElasticSearch基本查询一（英文分词）

转x33g5p2x  于2021-12-19 转载在 其他  
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废话不多说首先准备数据，我们先添加几个文档

PUT /lib3/user/1
{ 
  "name" : "zhaoliu",
  "address" :"hei long jiang sheng tie ling shi",
  "age" : 50,
  "birthday" : "1970-12-12",
  "interests": "xi buan hejiu, duanlian, lvyou"
}

PUT /lib3/user/2
{
  "name" :"zhaoming" ,
  "address" : "bei jing hai dian qu qing he zhen",
  "age" : 20,
  "birthday" : "1998-10-12" ,
  "interests": "xi huan hejiu, duanlian, changge"
}

PUT /lib3/user/3
{
  "name" : "lisi",
  "address" : "bei jing hai dian qu qing he zhen",
  "age" : 23,
  "birthday" : "1998-10-12" ,
  "interests": "xi huan hejiu,duanlian, changge"
}

PUT /lib3/user/4
{
  "name": "wangwu",
  "address" : "bei jing hai dian qu qing he zhen",
  "age": 26,
  "birthday" : "1995-10-12" ,
  "interests": "xi huan biancheng, tingyinyue, lvyou"
}

PUT /lib3/user/5
{
  "name" :"zhangsan",
  "address" : "bei jing chao yang qu",
  "age" : 29,
  "birthday" : "1988-10-12",
  "interests": "xi huan tingyinyue , changge , tiaowu"
}

简单通过name查找lisi这个人的基本信息  GET /lib3/user/_search?q=name:lisi

{
  "took" : 43,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "3",
        "_score" : 0.2876821,
        "_source" : {
          "name" : "lisi",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 23,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu,duanlian, changge"
        }
      }
    ]
  }
}

这个max_score：相关匹配度分数（这是根据ElasticSearch的算法计算出来的）

查询兴趣爱好interests喜欢changge（唱歌）的人，并且年龄倒叙排

GET /lib3/user/_search?q=interests:changge&sort=age:desc
{
  "took" : 124,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 3,
    "max_score" : null,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "5",
        "_score" : null,
        "_source" : {
          "name" : "zhangsan",
          "address" : "bei jing chao yang qu",
          "age" : 29,
          "birthday" : "1988-10-12",
          "interests" : "xi huan tingyinyue , changge , tiaowu"
        },
        "sort" : [
          29
        ]
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "3",
        "_score" : null,
        "_source" : {
          "name" : "lisi",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 23,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu,duanlian, changge"
        },
        "sort" : [
          23
        ]
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "2",
        "_score" : null,
        "_source" : {
          "name" : "zhaoming",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 20,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu, duanlian, changge"
        },
        "sort" : [
          20
        ]
      }
    ]
  }
}

term和terms查询(查找zhaoliu这个人的信息)

term query会去倒排索弓|中寻找确切的term,它并不知道分词器的存在。这种查询适合keyword、numeric. date.
term:查询某个字段里含有某个关键词的文档
GET /lib3/user/_search/****{ "query":{ "term": {interests": "changge"}}}
terms:查询某个字段里合有多个关键词的文档
GET /ib3/user/_search { "query":{ "terms':{ "interests": ["hejiu","changge']}}

GET /lib3/user/_search
{
  "query": {
    "term": {
      "name": {
        "value": "zhaoliu"
      }
    }
  }
}

GET /lib3/user/_search
{
  "query": {
    "term": {
      "name": "zhaoliu"
    }
  }
}
{
  "took" : 5,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.2876821,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "1",
        "_score" : 0.2876821,
        "_source" : {
          "name" : "zhaoliu",
          "address" : "hei long jiang sheng tie ling shi",
          "age" : 50,
          "birthday" : "1970-12-12",
          "interests" : "xi buan hejiu, duanlian, lvyou"
        }
      }
    ]
  }
}

查找兴趣爱好interests为hejiu changge的人的信息

GET /lib3/user/_search
{
  "query": {
    "terms": {
      "interests": ["hejiu","changge"]
    }
  }
}
{
  "took" : 56,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 4,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "5",
        "_score" : 1.0,
        "_source" : {
          "name" : "zhangsan",
          "address" : "bei jing chao yang qu",
          "age" : 29,
          "birthday" : "1988-10-12",
          "interests" : "xi huan tingyinyue , changge , tiaowu"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "2",
        "_score" : 1.0,
        "_source" : {
          "name" : "zhaoming",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 20,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu, duanlian, changge"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "1",
        "_score" : 1.0,
        "_source" : {
          "name" : "zhaoliu",
          "address" : "hei long jiang sheng tie ling shi",
          "age" : 50,
          "birthday" : "1970-12-12",
          "interests" : "xi buan hejiu, duanlian, lvyou"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "3",
        "_score" : 1.0,
        "_source" : {
          "name" : "lisi",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 23,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu,duanlian, changge"
        }
      }
    ]
  }
}

只要含有一个关键词的都会被查询出来总共四个人有关于hejiu changge要么changge要么hejiu 要么两者都

如果我只想取前2个人使用from:0 (表示从第一个文档开始)       size:2（取2个文档）

GET /lib3/user/_search
{
  "from":0,
  "size":2,
  "query": {
    "terms": {
      "interests": ["hejiu","changge"]
    }
  }
}
{
  "took" : 81,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 4,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "5",
        "_score" : 1.0,
        "_source" : {
          "name" : "zhangsan",
          "address" : "bei jing chao yang qu",
          "age" : 29,
          "birthday" : "1988-10-12",
          "interests" : "xi huan tingyinyue , changge , tiaowu"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "2",
        "_score" : 1.0,
        "_source" : {
          "name" : "zhaoming",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 20,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu, duanlian, changge"
        }
      }
    ]
  }
}

以上查询都是没有版本号的我们要获取版本号，只需要加一个version:true

GET /lib3/user/_search
{
  "version": true, 
  "query": {
    "terms": {
      "interests": ["hejiu","changge"]
    }
  }
}
{
  "took" : 33,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : 4,
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "5",
        "_version" : 1,
        "_score" : 1.0,
        "_source" : {
          "name" : "zhangsan",
          "address" : "bei jing chao yang qu",
          "age" : 29,
          "birthday" : "1988-10-12",
          "interests" : "xi huan tingyinyue , changge , tiaowu"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "2",
        "_version" : 1,
        "_score" : 1.0,
        "_source" : {
          "name" : "zhaoming",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 20,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu, duanlian, changge"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "1",
        "_version" : 1,
        "_score" : 1.0,
        "_source" : {
          "name" : "zhaoliu",
          "address" : "hei long jiang sheng tie ling shi",
          "age" : 50,
          "birthday" : "1970-12-12",
          "interests" : "xi buan hejiu, duanlian, lvyou"
        }
      },
      {
        "_index" : "lib3",
        "_type" : "user",
        "_id" : "3",
        "_version" : 1,
        "_score" : 1.0,
        "_source" : {
          "name" : "lisi",
          "address" : "bei jing hai dian qu qing he zhen",
          "age" : 23,
          "birthday" : "1998-10-12",
          "interests" : "xi huan hejiu,duanlian, changge"
        }
      }
    ]
  }
}

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原文链接 : https://blog.csdn.net/ywl470812087/article/details/104865525

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