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Update description of mandatory timestamp field #94983

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Update description of mandatory timestamp field #94983

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4 changes: 3 additions & 1 deletion docs/reference/eql/eql.asciidoc
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Expand Up @@ -32,7 +32,9 @@ describe activity that goes beyond IOCs.

With the exception of sample queries, EQL searches require that the searched
data stream or index contains a _timestamp_ field. By default, EQL uses the
`@timestamp` field from the {ecs-ref}[Elastic Common Schema (ECS)].
`@timestamp` field from the {ecs-ref}[Elastic Common Schema (ECS)].
In addition, the `@timestamp` field must have milliseconds granularity, hence
be mapped as `epoch_millis` or similar.

EQL searches also require an _event category_ field, unless you use the
<<eql-syntax-match-any-event-category,`any` keyword>> to search for documents
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