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9 changes: 9 additions & 0 deletions docs/reference/eql/syntax.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -794,6 +794,15 @@ For a list of supported pipes, see <<eql-pipe-ref>>.

EQL does not support the following features and syntax.

[discrete]
[[eql-uses-fields-parameter]]
==== EQL uses the `fields` parameter

EQL retrieves field values using the search API's <<search-fields-param,`fields`
parameter>>. Any limitations on the `fields` parameter also apply to EQL
queries. For example, if `_source` is disabled for any returned fields or at
index level, the values cannot be retrieved.

[discrete]
[[eql-compare-fields]]
==== Comparing fields
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