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[DOCS] Clarify compatibility for upgrade via reindex #60045

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2 changes: 2 additions & 0 deletions docs/reference/upgrade/reindex_upgrade.asciidoc
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@ have indices created in 5.x or before, you must reindex or delete them
before upgrading to {version}. {es} nodes will fail to start if
incompatible indices are present. Snapshots of 5.x or earlier indices cannot be
restored to a 7.x cluster even if they were created by a 6.x cluster.
Any index created in 6.x is compatible with 7.x and does not require a reindex.


This restriction also applies to the internal indices that are used by
{kib} and the {xpack} features. Therefore, before you can use {kib} and
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