Elasticsearch query_string search using wildcard

Question

Elasticsearch when queried with the following returns no results.

{  
  "query":{  
    "filtered":{  
      "query":{  
        "bool":{  
          "should":[  
            {  
              "query_string":{  
                "query":"a*",
                "analyze_wildcard":true
              }
            }
          ]
        }
      }
    }
  }
}

When I use "al*" instead of "a*", I am getting proper results. This is happening for "a*" only. When I use any others like "b*" or "c*", etc. the results are proper

I am using elasticsearch version 0.90.12

Val · Accepted Answer · 2016-11-28 10:57:25Z

1

This is because a is a stop word and gets eliminated by the standard analyzer that analyzes your query. You can probably get around this by specifying a different analyzer, such as keyword instead of using the standard one. Another option is to leave analyze_wildcard set to false.

{  
  "query":{  
    "filtered":{  
      "query":{  
        "bool":{  
          "should":[  
            {  
              "query_string":{  
                "query":"a*",
                "analyze_wildcard":true,
                "analyzer": "keyword"
              }
            }
          ]
        }
      }
    }
  }
}

answered Nov 28, 2016 at 10:57

Val

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3 Comments

tungri Over a year ago

Thanks for you reply. Can you please explain how "a.*" in the query above searches for. I have a record "A. J. Satya" and it is not getting returned when searched using "a.*" in the above query.

Val Over a year ago

The problem is that at indexing time the value A. J. Satya will get tokenized as the tokens j and satya because a is an english stop word and gets discarded. You probably need to change the analyzer you're using at indexing time too.

tungri Over a year ago

Thanks for the explanation.

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