ElasticSearch Introduction (two) - Simple Query

Return all records

Using the GET method, direct request / Index / _search, returns all records.

GET /accounts/_search
{
    "took": 683,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 1.0,
        "hits": [
            {
                "_index": "Accounts" ,
                "_type" : "Person" ,
                "the _id" : ". 1" ,
                "_score" : 1.0 ,
                "_Source" : {
                    "User" : " Joe Smith",
                    "title":"Engineer",
                    " desc ":"database management, software development"
                }
            }
        ]
    }
}

In the above code, the returned results took field indicates the time-consuming operation (in milliseconds), TIMED_OUT field indicates whether a timeout, Hits field indicates the record hit, meaning inside the sub-fields are as follows.

total: Returns the number of records, the present embodiment is two.
max_score: the highest matching degree, the present embodiment is 1.0.
hits: returns an array of records.

Returned records, each record has a field _score, the program indicates a match, according to this default field in descending order.

research all

Elastic very particular query, use your own query syntax requires GET request with the data volume.

GET /accounts/_search
{
    "query": {
        "match": {
            "desc": "软件"
        }
    }
}

The above code uses the Match query , matching the specified condition is desc field which contains the "software" of the word. Returned the following results.

{
    "took": 1,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 0.5753642,
        "hits": [
            {
                "_index": "accounts",
                "_Type" : "Person" ,
                "the _id" : ". 1" ,
                "_score" : 0.5753642 ,
                "_Source" : {
                    "User" : " Joe Smith",
                    "title":"Engineer",
                    "desc":"database management, software development"
                }
            }
        ]
    }
}

Elastic return a default 10 results, this setting can be changed by the size field.

GET /person/_search
{
    "query": {
        "match": {
            "desc": "管理"
        }
    },
    "size": 1
}

上面代码指定，每次只返回一条结果。

还可以通过from字段，指定位移。

GET /accounts/_search
{
    "query": {
        "match": {
            "desc": "管理"
        }
    },
    "from": 1,
    "size": 1
}

上面代码指定，从位置1开始（默认是从位置0开始），只返回一条结果。

逻辑运算

如果有多个搜索关键字， Elastic 认为它们是or关系。

GET /accounts/_search
{
    "query": {
        "match": {
            "desc": "软件系统"
        }
    },
    "from": 0,
    "size": 1
}

上面代码搜索的是软件 or 系统。

如果要执行多个关键词的and搜索，必须使用布尔查询。

GET /accounts/_search
{
    "query": {
        "bool": {
            "must": [
                {
                    "match_phrase": {
                        "user": "张三"
                    }
                },
                {
                    "match": {
                        "desc": "数据库"
                    }
                }
            ]
        }
    }
}

ElasticSearch Introduction (two) - Simple Query

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