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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2020-07-13 09:04:15 -04:00
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experimental::[]
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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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2020-07-13 09:03:55 -04:00
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sub-fields of a `nested` field. However, data streams and indices containing
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`nested` field mappings are otherwise supported.
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2020-05-05 11:46:06 -04:00
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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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* {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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2020-06-30 09:12:54 -04:00
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* The following {eql-ref}/pipes.html[pipes]:
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** {eql-ref}/pipes.html#count[`count`]
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** {eql-ref}/pipes.html#filter[`filter`]
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** {eql-ref}/pipes.html#sort[`sort`]
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** {eql-ref}/pipes.html#unique[`unique`]
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** {eql-ref}/pipes.html#unique-count[`unique_count`]
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