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Add a known issue for upgrading from 5.x to 6.3.0 #31501

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3 changes: 3 additions & 0 deletions docs/reference/release-notes/6.3.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,13 @@
[float]
=== Known issues

Upgrades from any 5.x version will fail for indexes which are prepared using the <<indices-synced-flush, _synced flush API>>, or were automatically synced flushed due to inactivity. If upgrading from those version, please wait for 6.3.1 to be released.
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synced flushed -> sync-flushed
from those versionS


Clusters with a Gold or Platinum license that are upgrading to 6.3 will need to explicitly set
`xpack.security.enabled: true` in `elasticsearch.yml` to upgrade successfully.
If this value is not set, the cluster will be unable to form after upgrade.


Also see <<breaking-changes-6.3>>.

[[breaking-6.3.0]]
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