07.suggester简述

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Suggesters

就是提示词功能,根据提供的内容朝招相似的
The suggest feature suggests similar looking terms based on a provided text by using a suggester. Parts of the suggest feature are still under development.

The suggest request part is defined alongside the query part in a _search request. If the query part is left out, only suggestions are returned.

_suggest endpoint has been deprecated in favour of using suggest via _search endpoint. In 5.0, the _search endpoint has been optimized for suggest only search requests.

POST twitter/_search
{"query" : {"match": {"message": "tring out Elasticsearch"}},"suggest" : {"my-suggestion" : {"text" : "tring out Elasticsearch","term" : {"field" : "message"}}}
}

Several suggestions can be specified per request. Each suggestion is identified with an arbitrary name. In the example below two suggestions are requested. Both my-suggest-1 and my-suggest-2 suggestions use the term suggester, but have a different text.
一次请求可以有多个suggest

POST _search
{"suggest": {"my-suggest-1" : {"text" : "tring out Elasticsearch","term" : {"field" : "message"}},"my-suggest-2" : {"text" : "kmichy","term" : {"field" : "user"}}}
}

下面的返回体重包括 my-suggest-1 and my-suggest-2，每个都有自己独立的结果
返回

{"_shards": ..."hits": ..."took": 2,"timed_out": false,"suggest": {"my-suggest-1": [ {"text": "tring","offset": 0,"length": 5,"options": [ {"text": "trying", "score": 0.8, "freq": 1 } ]}, {"text": "out","offset": 6,"length": 3,"options": []}, {"text": "elasticsearch","offset": 10,"length": 13,"options": []} ],"my-suggest-2": ...}
}

每个options数组都包含一个option对象，该option对象包含建议文本，其文档频率和与suggest输入文本相比的得分。分数的含义取决于所使用的suggester。term suggester的得分是基于编辑距离的。

可以在使用多个suggest的时候把suggest text单独拿出来

POST _search
{"suggest": {"text" : "tring out Elasticsearch","my-suggest-1" : {"term" : {"field" : "message"}},"my-suggest-2" : {"term" : {"field" : "user"}}}
}

The suggest text can in the above example also be specified as suggestion specific option. The suggest text specified on suggestion level override the suggest text on the global level.

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