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Elastic Docs ›Elasticsearch Guide [7.8] ›Query DSL ›Term-level queries

Wildcard query

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Wildcard query

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Returns documents that contain terms matching a wildcard pattern.

A wildcard operator is a placeholder that matches one or more characters. For example, the * wildcard operator matches zero or more characters. You can combine wildcard operators with other characters to create a wildcard pattern.

Example request

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The following search returns documents where the user.id field contains a term that begins with ki and ends with y. These matching terms can include kiy, kity, or kimchy.

GET /_search
{
  "query": {
    "wildcard": {
      "user.id": {
        "value": "ki*y",
        "boost": 1.0,
        "rewrite": "constant_score"
      }
    }
  }
}

Top-level parameters for wildcard

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<field>
(Required, object) Field you wish to search.

Parameters for <field>

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value

(Required, string) Wildcard pattern for terms you wish to find in the provided <field>.

This parameter supports two wildcard operators:

  • ?, which matches any single character
  • *, which can match zero or more characters, including an empty one

Avoid beginning patterns with * or ?. This can increase the iterations needed to find matching terms and slow search performance.

boost

(Optional, float) Floating point number used to decrease or increase the relevance scores of a query. Defaults to 1.0.

You can use the boost parameter to adjust relevance scores for searches containing two or more queries.

Boost values are relative to the default value of 1.0. A boost value between 0 and 1.0 decreases the relevance score. A value greater than 1.0 increases the relevance score.

rewrite
(Optional, string) Method used to rewrite the query. For valid values and more information, see the rewrite parameter.

Notes

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Allow expensive queries

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Wildcard queries will not be executed if search.allow_expensive_queries is set to false.

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