[DOCS] Clarify compatibility for upgrade via reindex (#60045) (#60209)

Co-authored-by: Inbar Shimshon <inbar.shimshon@elastic.co>
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James Rodewig 2020-07-27 09:38:39 -04:00 committed by GitHub
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@ -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