76 lines
2.2 KiB
Plaintext
76 lines
2.2 KiB
Plaintext
[[query-dsl-wildcard-query]]
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=== Wildcard query
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++++
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<titleabbrev>Wildcard</titleabbrev>
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++++
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Returns documents that contain terms matching a wildcard pattern.
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A wildcard operator is a placeholder that matches one or more characters. For
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example, the `*` wildcard operator matches zero or more characters. You can
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combine wildcard operators with other characters to create a wildcard pattern.
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[[wildcard-query-ex-request]]
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==== Example request
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The following search returns documents where the `user` field contains a term
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that begins with `ki` and ends with `y`. These matching terms can include `kiy`,
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`kity`, or `kimchy`.
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[source,console]
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----
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GET /_search
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{
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"query": {
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"wildcard": {
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"user": {
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"value": "ki*y",
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"boost": 1.0,
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"rewrite": "constant_score"
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}
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}
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}
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}
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----
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[[wildcard-top-level-params]]
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==== Top-level parameters for `wildcard`
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`<field>`::
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(Required, object) Field you wish to search.
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[[wildcard-query-field-params]]
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==== Parameters for `<field>`
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`value`::
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(Required, string) Wildcard pattern for terms you wish to find in the provided
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`<field>`.
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+
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--
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This parameter supports two wildcard operators:
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* `?`, which matches any single character
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* `*`, which can match zero or more characters, including an empty one
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WARNING: Avoid beginning patterns with `*` or `?`. This can increase
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the iterations needed to find matching terms and slow search performance.
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--
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`boost`::
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(Optional, float) Floating point number used to decrease or increase the
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<<relevance-scores,relevance scores>> of a query. Defaults to `1.0`.
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+
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You can use the `boost` parameter to adjust relevance scores for searches
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containing two or more queries.
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+
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Boost values are relative to the default value of `1.0`. A boost value between
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`0` and `1.0` decreases the relevance score. A value greater than `1.0`
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increases the relevance score.
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`rewrite`::
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(Optional, string) Method used to rewrite the query. For valid values and more information, see the
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<<query-dsl-multi-term-rewrite, `rewrite` parameter>>.
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==== Notes
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===== Allow expensive queries
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Wildcard queries will not be executed if <<query-dsl-allow-expensive-queries, `search.allow_expensive_queries`>>
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is set to false.
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