Elasticsearch搜索API

小咪咪 2024-04-17 19:40 30阅读 0赞

此API用于在**Elasticsearch**中搜索内容。

## 多索引 ##

**Elasticsearch**允许我们搜索存在于所有索引或一些特定索引中的文档。 例如，如果我们需要搜索名称包含`central`的所有文档。  
我们可以执行下面的命令

//这里没有指定索引名称，所以是搜索所有的索引，找含有name字段，且字段名的值是central的文档
    GET http://localhost:9200/_search?q = name:central

响应结果是

{ 
       "took":78, "timed_out":false, "_shards":{ "total":10, "successful":10, "failed":0},
       "hits":{ 
          "total":1, "max_score":0.19178301, "hits":[{ 
             "_index":"schools", "_type":"school", "_id":"1", "_score":0.19178301,
             "_source":{ 
                "name":"Central School", "description":"CBSE Affiliation", 
                "street":"Nagan", "city":"paprola", "state":"HP", "zip":"176115",
                "location":[31.8955385, 76.8380405], "fees":2000, 
                "tags":["Senior Secondary", "beautiful campus"], "rating":"3.5"
             }
          }]
       }
    }

或者，同样地我们可以在`schools`，`schools_gov`索引中搜索

## 多类型 ##

还可以在所有类型或某种指定类型的索引中搜索所有文档。 例如，

//这里指定了索引名为schools,但是并没有指定type,所以是在所有的type中进行搜索
    Get http://localhost:9200/schools/_search?q = tags:sports

响应结果为

{ 
       "took":16, "timed_out":false, "_shards":{ "total":5, "successful":5, "failed":0},
       "hits":{ 
          "total":1, "max_score":0.5, "hits":[{ 
             "_index":"schools", "_type":"school", "_id":"2", "_score":0.5,
             "_source":{ 
                "name":"Saint Paul School", "description":"ICSE Afiliation", 
                "street":"Dawarka", "city":"Delhi", "state":"Delhi", "zip":"110075", 
                "location":[28.5733056, 77.0122136], "fees":5000, 
                "tags":["Good Faculty", "Great Sports"], "rating":"4.5"
             }
          }]
       }
    }

## URI搜索 ##

如下这些参数可以使用统一资源标识符在搜索操作中传递  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjQxOTU3_size_16_color_FFFFFF_t_70]

## 请求正文搜索 ##

还可以在请求正文中使用查询`DSL`来指定查询，并且在前面的章节中已经给出了很多示例，

//指定了索引名为schools,但是没有指定type类型名，所以是在该索引下的所有类型中搜索
    POST http://localhost:9200/schools/_search
    { 
       "query":{ 
          "query_string":{    
             "query":"up"  //因为没有指定具体查询的字段，所以是在所有的字段中查询字段包含“up”的结果
          }
       }
    }

响应结果为

……………………………………………….
    { 
       "_source":{ 
          "name":"City School", "description":"ICSE", "street":"West End",
          "city":"Meerut", "state":"UP", "zip":"250002", "location":[28.9926174, 77.692485],
          "fees":3500, "tags":["Well equipped labs"],"rating":"4.5"
       }
    }

本文转载自：https://www.yiibai.com/elasticsearch/elasticsearch\_search\_apis.html

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzQwMjQxOTU3_size_16_color_FFFFFF_t_70]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/545dbbcdb16640ad9c89ea7bed70a6e0.png