Elasticsearch由浅入深（九）搜索引擎：query DSL、filter与query、query搜索实战

search api的基本语法

语法概要：

GET /_search
{}

GET /index1,index2/type1,type2/_search
{}

GET /_search
{
  "from": 0,
  "size": 10
}

http协议中get是否可以带上request body？

HTTP协议，一般不允许get请求带上request body，但是因为get更加适合描述查询数据的操作，因此还是这么用了。

很多浏览器，或者是服务器，也都支持GET+request body模式

如果遇到不支持的场景，也可以用POST /_search

GET /_search?from=0&size=10

POST /_search
{
  "from":0,
  "size":10
}

query DSL

一个例子让你明白什么是query DSL

GET /_search
{
    "query": {
        "match_all": {}
    }
}

Query DSL的基本语法

GET /{index}/_search/{type}
{
    "各种条件"
}

示例：

GET /test_index/test_type/_search 
{
  "query": {
    "match": {
      "test_field": "test"
    }
  }
}


{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 3,
    "max_score": 0.843298,
    "hits": [
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "6",
        "_score": 0.843298,
        "_source": {
          "test_field": "test test"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "8",
        "_score": 0.43445712,
        "_source": {
          "test_field": "test client 2"
        }
      },
      {
        "_index": "test_index",
        "_type": "test_type",
        "_id": "7",
        "_score": 0.25316024,
        "_source": {
          "test_field": "test client 1"
        }
      }
    ]
  }
}

组合多个搜索条件

搜索需求：title必须包含elasticsearch，content可以包含elasticsearch也可以不包含，author_id必须不为111

构造数据：

PUT /website/article/1
{
  "title":"my elasticsearch article",
  "content":"es is very bad",
  "author_id":110
}

PUT /website/article/2
{
  "title":"my hadoop article",
  "content":"hadoop is very bad",
  "author_id":111
}

PUT /website/article/3
{
  "title":"my hadoop article",
  "content":"hadoop is very good",
  "author_id":111
}

组合查询：

GET /website/article/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "title": "elasticsearch"
          }
        }
      ],
      "should": [
        {
          "match": {
            "content": "elasticsearch"
          }
        }
      ],
      "must_not": [
        {
          "match": {
            "author_id": 111
          }
        }
      ]
    }
  }
}

查询结果：

{
  "took": 7,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "failed": 0
  },
  "hits": {
    "total": 1,
    "max_score": 0.25316024,
    "hits": [
      {
        "_index": "website",
        "_type": "article",
        "_id": "1",
        "_score": 0.25316024,
        "_source": {
          "title": "my elasticsearch article",
          "content": "es is very bad",
          "author_id": 110
        }
      }
    ]
  }
}

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