62 lines
1.3 KiB
Plaintext
62 lines
1.3 KiB
Plaintext
[[query-dsl-exists-query]]
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=== Exists Query
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Returns documents that contain a value other than `null` or `[]` in a provided
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field.
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[[exists-query-ex-request]]
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==== Example request
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[source,js]
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----
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GET /_search
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{
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"query": {
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"exists": {
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"field": "user"
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}
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}
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}
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----
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// CONSOLE
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[[exists-query-top-level-params]]
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==== Top-level parameters for `exists`
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`field`::
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Name of the field you wish to search.
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+
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To return a document, this field must exist and contain a value other
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than `null` or `[]`. These values can include:
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+
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* Empty strings, such as `""` or `"-"`
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* Arrays containing `null` and another value, such as `[null, "foo"]`
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* A custom <<null-value, `null-value`>>, defined in field mapping
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[[exists-query-notes]]
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==== Notes
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[[find-docs-null-values]]
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===== Find documents with null values
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To find documents that contain only `null` values or `[]` in a provided field,
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use the `must_not` <<query-dsl-bool-query, boolean query>> with the `exists`
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query.
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The following search returns documents that contain only `null` values or `[]`
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in the `user` field.
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[source,js]
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----
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GET /_search
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{
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"query": {
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"bool": {
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"must_not": {
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"exists": {
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"field": "user"
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}
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}
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}
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}
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}
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----
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// CONSOLE |