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@@ -28,7 +28,9 @@ back up a cluster is by using the snapshot and restore functionality.
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[float]
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=== Version compatibility
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-IMPORTANT: Version compatibility refers to the underlying Lucene index compatibility. Follow the {ref}/set-upgrade.html[upgrade Elasticsearch documentation] when migrating between versions.
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+IMPORTANT: Version compatibility refers to the underlying Lucene index
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+compatibility. Follow the <<setup-upgrade,Upgrade documentation>>
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+when migrating between versions.
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A snapshot contains a copy of the on-disk data structures that make up an
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index. This means that snapshots can only be restored to versions of
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Luca Cavanna