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Clarify version compatibility in snapshot/restore docs (#39329)

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Alex Doerr 2019-03-18 06:29:36 -04:00 committed by Luca Cavanna
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docs/reference/modules/snapshots.asciidoc
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@ -28,6 +28,10 @@ back up a cluster is by using the snapshot and restore functionality.
[float] [float]
=== Version compatibility === Version compatibility
IMPORTANT: Version compatibility refers to the underlying Lucene index
compatibility. Follow the <<setup-upgrade,Upgrade documentation>>
when migrating between versions.
A snapshot contains a copy of the on-disk data structures that make up an A snapshot contains a copy of the on-disk data structures that make up an
index. This means that snapshots can only be restored to versions of index. This means that snapshots can only be restored to versions of
Elasticsearch that can read the indices: Elasticsearch that can read the indices: