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[7.13] [DOCS] Add retrieving runtime fields to introduction (#76084) #76101

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Aug 4, 2021
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[7.13] [DOCS] Add retrieving runtime fields to introduction (#76084) #76101

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6 changes: 6 additions & 0 deletions docs/reference/mapping/runtime.asciidoc
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Expand Up @@ -14,6 +14,11 @@ sees runtime fields no differently. You can define runtime fields in the
<<runtime-search-request,search request>>. Your choice, which is part of the
inherent flexibility of runtime fields.

Use the <<search-fields,`fields`>> parameter on the `_search` API to
<<runtime-retrieving-fields,retrieve the values of runtime fields>>. Runtime
fields won't display in `_source`, but the `fields` API works for all fields,
even those that were not sent as part of the original `_source`.

Runtime fields are useful when working with log data
(see <<runtime-examples,examples>>), especially when you're unsure about the
data structure. Your search speed decreases, but your index size is much
Expand Down Expand Up @@ -632,6 +637,7 @@ which still returns in the response:

[[runtime-retrieving-fields]]
=== Retrieve a runtime field

Use the <<search-fields,`fields`>> parameter on the `_search` API to retrieve
the values of runtime fields. Runtime fields won't display in `_source`, but
the `fields` API works for all fields, even those that were not sent as part of
Expand Down