Question

下面的查询返回匹配，例如name是“按银行余额”：

GET /_search

{ "query": {
    "multi_match": { "query": "Balances",
                     "fields": ["name","descrip","notes"] 
                   }
           }
 }

那为什么为什么不返回任何东西呢？请注意，查询的限制较少，单词是“ Balance”，而不是带有s的“ Balances”。

GET /_search

{ "query": {
    "multi_match": { "query": "Balance",
                     "fields": ["name","descrip","notes"] 
                   }
           }
 }

什么搜索会同时返回两者？

Answer 1

You need to change your mapping to be able to do that.

If you didn't specified a mapping with specific analyzers when creating your index, elasticsearch will use the default mapping and analyzer.

The default mapping will map each text field as both text and keyword, so you will be able to performe full text search (match part of the string) and keyword search (match the whole string), but it will use the standard analyzer.

With the standard analyzer your example Balances by bank becomes the following list of tokens: [Balances, by, bank], those items are added to the inverted index and elasticsearch can find the documents when you search for any of them.

When you search for just Balance, this term does not exist in the inverted index and elasticsearch returns nothing.

To be able to return both Balance and Balances you need to change your mapping and use the analyzer for the english language, this analyzer will reduce your terms to their stem and match Balance, Balances as also Balancing, Balanced, Balancer etc.

Look at this part of the documentation to see how the analysis process work.

And of course, you can also search for Balance* and it will return both Balance and Balances, but it is a different query.

限制较少的搜索不会在ElasticSearch中返回任何匹配

1 个答案: