Elasticsearch-搜索API

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📜 Elasticsearch-搜索API

📅 最后修改于: 2020-10-30 14:17:38 🧑 作者: Mango

该API用于在Elasticsearch中搜索内容。用户可以通过发送带有查询字符串作为参数的get请求进行搜索，或者可以在发布请求的消息正文中发布查询。主要是所有搜索API都是多索引，多类型的。

多索引

Elasticsearch允许我们搜索所有索引或某些特定索引中存在的文档。例如，如果我们需要搜索名称包含“ central”的所有文档，则可以执行以下操作：

GET /_all/_search?q=city:paprola

在运行上面的代码时，我们得到以下响应-

{
   "took" : 33,
   "timed_out" : false,
   "_shards" : {
      "total" : 7,
      "successful" : 7,
      "skipped" : 0,
      "failed" : 0
   },
   "hits" : {
      "total" : {
         "value" : 1,
         "relation" : "eq"
      },
      "max_score" : 0.9808292,
      "hits" : [
         {
            "_index" : "schools",
            "_type" : "school",
            "_id" : "5",
            "_score" : 0.9808292,
            "_source" : {
               "name" : "Central School",
               "description" : "CBSE Affiliation",
               "street" : "Nagan",
               "city" : "paprola",
               "state" : "HP",
               "zip" : "176115",
               "location" : [
                  31.8955385,
                  76.8380405
               ],
               "fees" : 2200,
               "tags" : [
                  "Senior Secondary",
                  "beautiful campus"
               ],
               "rating" : "3.3"
            }
         }
      ]
   }
}

URI搜索

使用统一资源标识符，可以在搜索操作中传递许多参数-

S.No	Parameter & Description
1	Q This parameter is used to specify query string.
2	lenient This parameter is used to specify query string.Format based errors can be ignored by just setting this parameter to true. It is false by default.
3	fields This parameter is used to specify query string.
4	sort We can get sorted result by using this parameter, the possible values for this parameter is fieldName, fieldName:asc/fieldname:desc
5	timeout We can restrict the search time by using this parameter and response only contains the hits in that specified time. By default, there is no timeout.
6	terminate_after We can restrict the response to a specified number of documents for each shard, upon reaching which the query will terminate early. By default, there is no terminate_after.
7	from The starting from index of the hits to return. Defaults to 0.
8	size It denotes the number of hits to return. Defaults to 10.

要求搜身

我们还可以在请求正文中使用查询DSL指定查询，在前面的章节中已经给出了许多示例。这里给出一个这样的例子-

POST /schools/_search
{
   "query":{
      "query_string":{
         "query":"up"
      }
   }
}

在运行上面的代码时，我们得到以下响应-

{
   "took" : 11,
   "timed_out" : false,
   "_shards" : {
      "total" : 1,
      "successful" : 1,
      "skipped" : 0,
      "failed" : 0
   },
   "hits" : {
      "total" : {
         "value" : 1,
         "relation" : "eq"
      },
      "max_score" : 0.47000363,
      "hits" : [
         {
            "_index" : "schools",
            "_type" : "school",
            "_id" : "4",
            "_score" : 0.47000363,
            "_source" : {
               "name" : "City Best School",
               "description" : "ICSE",
               "street" : "West End",
               "city" : "Meerut",
               "state" : "UP",
               "zip" : "250002",
               "location" : [
                  28.9926174,
                  77.692485
               ],
               "fees" : 3500,
               "tags" : [
                  "fully computerized"
               ],
               "rating" : "4.5"
            }
         }
      ]
   }
}