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[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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docs/reference/upgrade/reindex_upgrade.asciidoc
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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 before upgrading to {version}. {es} nodes will fail to start if
incompatible indices are present. Snapshots of 5.x or earlier indices cannot be 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. 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 This restriction also applies to the internal indices that are used by
{kib} and the {xpack} features. Therefore, before you can use {kib} and {kib} and the {xpack} features. Therefore, before you can use {kib} and