ElasticSearch：建议完成多搜索

Question

我在ES中使用建议API完成。我的实现工作（代码如下），但我想在查询中搜索多个单词。在下面的例子中，如果我查询搜索“word”，它会找到“wordpress”并输出“Found”。我试图完成的是用“词博客杂志”这样的东西来查询所有标签，并且具有“找到”的输出。任何帮助，将不胜感激！

映射：

curl -XPUT "http://localhost:9200/test_index/" -d' 
    { 
    "mappings": { 
     "product": { 
     "properties": { 
      "description": { 
       "type": "string" 
      }, 
      "tags": { 
       "type": "string" 
      }, 
      "title": { 
       "type": "string" 
      }, 
      "tag_suggest": { 
       "type": "completion", 
       "index_analyzer": "simple", 
       "search_analyzer": "simple", 
       "payloads": false 
      } 
     } 
     } 
    } 
}' 

添加文档：

curl -XPUT "http://localhost:9200/test_index/product/1" -d' 
    { 
    "title": "Product1", 
    "description": "Product1 Description", 
    "tags": [ 
     "blog", 
     "magazine", 
     "responsive", 
     "two columns", 
     "wordpress" 
    ], 
    "tag_suggest": { 
     "input": [ 
     "blog", 
     "magazine", 
     "responsive", 
     "two columns", 
     "wordpress" 
     ], 
     "output": "Found" 
    } 
}' 

_suggest查询：

curl -XPOST "http://localhost:9200/test_index/_suggest" -d' 
    { 
    "product_suggest":{ 
     "text":"word", 
     "completion": { 
      "field" : "tag_suggest" 
     } 
    } 
}' 
The results are as we would expect: 
    { 
    "_shards": { 
     "total": 1, 
     "successful": 1, 
     "failed": 0 
    }, 
    "product_suggest": [ 
     { 
     "text": "word", 
     "offset": 0, 
     "length": 4, 
     "options": [ 
      { 
      "text": "Found", 
      "score": 1 
     }, 
     ] 
     } 
    ] 
} 

Answer 1

如果你愿意改用edge ngrams（或完整的n-gram，如果您需要他们），我认为它会解决你的问题。

我写了如何做到这一点，在这个博客后一个相当详细的解释：

https://qbox.io/blog/an-introduction-to-ngrams-in-elasticsearch

但我会在这里给你一个快速和肮脏的版本。诀窍是将ngram与_all field和match AND operator一起使用。

所以用这个映射：

PUT /test_index 
{ 
    "settings": { 
     "analysis": { 
     "filter": { 
      "ngram_filter": { 
       "type": "edge_ngram", 
       "min_gram": 2, 
       "max_gram": 20 
      } 
     }, 
     "analyzer": { 
      "ngram_analyzer": { 
       "type": "custom", 
       "tokenizer": "standard", 
       "filter": [ 
        "lowercase", 
        "ngram_filter" 
       ] 
      } 
     } 
     } 
    }, 
    "mappings": { 
     "doc": { 
     "_all": { 
      "type": "string", 
      "analyzer": "ngram_analyzer", 
      "search_analyzer": "standard" 
     }, 
     "properties": { 
      "word": { 
       "type": "string", 
       "include_in_all": true 
      }, 
      "definition": { 
       "type": "string", 
       "include_in_all": true 
      } 
     } 
     } 
    } 
} 

和一些文件：

PUT /test_index/_bulk 
{"index":{"_index":"test_index","_type":"doc","_id":1}} 
{"word":"democracy", "definition":"government by the people; a form of government in which the supreme power is vested in the people and exercised directly by them or by their elected agents under a free electoral system."} 
{"index":{"_index":"test_index","_type":"doc","_id":2}} 
{"word":"republic", "definition":"a state in which the supreme power rests in the body of citizens entitled to vote and is exercised by representatives chosen directly or indirectly by them."} 
{"index":{"_index":"test_index","_type":"doc","_id":3}} 
{"word":"oligarchy", "definition":"a form of government in which all power is vested in a few persons or in a dominant class or clique; government by the few."} 
{"index":{"_index":"test_index","_type":"doc","_id":4}} 
{"word":"plutocracy", "definition":"the rule or power of wealth or of the wealthy."} 
{"index":{"_index":"test_index","_type":"doc","_id":5}} 
{"word":"theocracy", "definition":"a form of government in which God or a deity is recognized as the supreme civil ruler, the God's or deity's laws being interpreted by the ecclesiastical authorities."} 
{"index":{"_index":"test_index","_type":"doc","_id":6}} 
{"word":"monarchy", "definition":"a state or nation in which the supreme power is actually or nominally lodged in a monarch."} 
{"index":{"_index":"test_index","_type":"doc","_id":7}} 
{"word":"capitalism", "definition":"an economic system in which investment in and ownership of the means of production, distribution, and exchange of wealth is made and maintained chiefly by private individuals or corporations, especially as contrasted to cooperatively or state-owned means of wealth."} 
{"index":{"_index":"test_index","_type":"doc","_id":8}} 
{"word":"socialism", "definition":"a theory or system of social organization that advocates the vesting of the ownership and control of the means of production and distribution, of capital, land, etc., in the community as a whole."} 
{"index":{"_index":"test_index","_type":"doc","_id":9}} 
{"word":"communism", "definition":"a theory or system of social organization based on the holding of all property in common, actual ownership being ascribed to the community as a whole or to the state."} 
{"index":{"_index":"test_index","_type":"doc","_id":10}} 
{"word":"feudalism", "definition":"the feudal system, or its principles and practices."} 
{"index":{"_index":"test_index","_type":"doc","_id":11}} 
{"word":"monopoly", "definition":"exclusive control of a commodity or service in a particular market, or a control that makes possible the manipulation of prices."} 
{"index":{"_index":"test_index","_type":"doc","_id":12}} 
{"word":"oligopoly", "definition":"the market condition that exists when there are few sellers, as a result of which they can greatly influence price and other market factors."} 

我可以在这两个领域的应用部分匹配（将与许多领域的工作，只要你想）是这样的：

POST /test_index/_search 
{ 
    "query": { 
     "match": { 
      "_all": { 
       "query": "theo go", 
       "operator": "and" 
      } 
     } 
    } 
} 

在这种情况下返回：

{ 
    "took": 2, 
    "timed_out": false, 
    "_shards": { 
     "total": 1, 
     "successful": 1, 
     "failed": 0 
    }, 
    "hits": { 
     "total": 1, 
     "max_score": 0.7601639, 
     "hits": [ 
     { 
      "_index": "test_index", 
      "_type": "doc", 
      "_id": "5", 
      "_score": 0.7601639, 
      "_source": { 
       "word": "theocracy", 
       "definition": "a form of government in which God or a deity is recognized as the supreme civil ruler, the God's or deity's laws being interpreted by the ecclesiastical authorities." 
      } 
     } 
     ] 
    } 
} 

这是我在这里使用的代码（还有更多的博客文章）：

http://sense.qbox.io/gist/e4093c25a8257499f54ced5a09f35b1eb48e4e3c

希望有所帮助。