使用通配符的Elasticsearch query_string搜索

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

Answer 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"
              }
            }
          ]
        }
      }
    }
  }
}