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Add note about changed fields API behaviour for nested #68813

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Feb 11, 2021
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Add note about changed fields API behaviour for nested #68813

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15 changes: 15 additions & 0 deletions docs/reference/migration/migrate_7_12.asciidoc
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Expand Up @@ -48,6 +48,21 @@ force-merge on these immutable indices will fail if the requested merge is not
a no-op.
====

[discrete]
[[breaking_712_search_changes]]
==== Search changes

[[fields-api-nested-fields]]
.The search APIs `fields` parameter returns fields inside `nested` fields grouped together.
[%collapsible]
====
*Details* +
In earlier versions, fields retrieved via `fields` in the search API were
returned as a flat list. From 7.12 on, fields inside an object that is mapped
using the `nested` field type are grouped together to maintain the independence of
each object inside the original nested array.
====

////
[discrete]
[[deprecated-7.11]]
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