2020-02-12 08:45:15 -05:00
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[role="xpack"]
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[testenv="basic"]
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[[eql-limitations]]
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== EQL limitations
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++++
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<titleabbrev>Limitations</titleabbrev>
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++++
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2020-06-02 11:03:12 -04:00
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dev::[]
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2020-02-12 08:45:15 -05:00
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2020-05-05 11:46:06 -04:00
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[discrete]
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[[eql-nested-fields]]
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=== EQL search on nested fields is not supported
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You cannot use EQL to search the values of a <<nested,`nested`>> field or the
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sub-fields of a `nested` field. However, indices containing `nested` field
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mappings are otherwise supported.
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2020-02-12 08:45:15 -05:00
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[discrete]
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[[eql-unsupported-syntax]]
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=== Unsupported syntax
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{es} supports a subset of {eql-ref}/index.html[EQL syntax]. {es} cannot run EQL
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queries that contain:
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2020-03-25 12:23:59 -04:00
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* Array functions:
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** {eql-ref}/functions.html#arrayContains[`arrayContains`]
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** {eql-ref}/functions.html#arrayCount[`arrayCount`]
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** {eql-ref}/functions.html#arraySearch[`arraySearch`]
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2020-02-12 08:45:15 -05:00
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* {eql-ref}/joins.html[Joins]
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* {eql-ref}/basic-syntax.html#event-relationships[Lineage-related keywords]:
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** `child of`
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** `descendant of`
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** `event of`
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* {eql-ref}/pipes.html[Pipes]
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2020-05-14 11:51:40 -04:00
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* {eql-ref}/sequences.html[State and timespan-related sequence keywords]:
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** `with maxspan`
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** `until`
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