Elasticsearch 入门

• 新建 PUT

    PUT 'localhost:9200/weather'

    @return {
        "acknowledged": true,
        "shards_acknowledged": true,
        "index": "weather"
    }

- 新增一条记录 
```
PUT localhost:9200/accounts/person/2
注：POSTMAN ->body ->raw (json)
    {
      "user": "张三",
      "title": "工程师",
      "desc": "数据库管理"
    }

@return{
    "_index": "accounts",
    "_type": "person",
    "_id": "2",
    "_version": 1,
    "result": "created",
    "_shards": {
        "total": 2,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 2,
    "_primary_term": 1
}
```

• 删除 DELETE

    DELETE 'localhost:9200/weather'

    @return {
        "acknowledged": true
    }

• POST 添加一个记录,不指定 Id

    localhost:9200/accounts/person

    {
      "user": "张si",
      "title": "工程师",
      "desc": "数据库管理"
    }
    生成随机id
    @return {
        "_index": "accounts",
        "_type": "person",
        "_id": "vFL2fXUBQ-J0hUIur3oG",
        "_version": 1,
        "result": "created",
        "_shards": {
            "total": 2,
            "successful": 1,
            "failed": 0
        },
        "_seq_no": 4,
        "_primary_term": 1
    }

• 查看记录 GET

    GET localhost:9200/accounts/person/1?pretty=true

    @return {
        "_index": "accounts",
        "_type": "person",
        "_id": "1",
        "_version": 2,
        "_seq_no": 1,
        "_primary_term": 1,
        "found": true,  //查询成功
        "_source": {    //原始记录
            "user": "张三",
            "title": "工程师",
            "desc": "数据库管理"
        }
    }

    GET localhost:9200/accounts/person/_search   //获取/Index/Type下所有数据
    
    @return {
        "took": 762,
        "timed_out": false,
        "_shards": {
            "total": 1,
            "successful": 1,
            "skipped": 0,
            "failed": 0
        },
        "hits": {
            "total": {
                "value": 4,
                "relation": "eq"
            },
            "max_score": 1,
            "hits": [
                {
                    "_index": "accounts",
                    "_type": "person",
                    "_id": "2",
                    "_score": 1,
                    "_source": {
                        "user": "张si",
                        "title": "工程师",
                        "desc": "数据库管理"
                    }
                },
                {
                    "_index": "accounts",
                    "_type": "person",
                    "_id": "u1LzfXUBQ-J0hUIuaXp9",
                    "_score": 1,
                    "_source": {
                        "user": "张si",
                        "title": "工程师",
                        "desc": "数据库管理"
                    }
                }
            ]
        }
    }

- Elastic 的查询非常特别，使用自己的查询语法，要求 GET 请求带有数据体。
```
    GET localhost:9200/accounts/person/_search
    //带有数据体
    @request{
      "query" : { "match" : { "desc" : "软件" }}
    }
```
- Elastic 默认一次返回10条结果，可以通过size字段改变这个设置
```
    @request{
      "query" : { "match" : { "desc" : "管理" }},
      "size": 1
    }
```
- 逻辑运算 OR 
```
    {
      "query" : { "match" : { "desc" : "软件 系统" }}
    }
```
- 逻辑运算 AND
```
    {
      "query": {
        "bool": {
          "must": [
            { "match": { "desc": "软件" } },
            { "match": { "desc": "系统" } }
          ]
        }
      }
    }
```
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