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Add details about older snapshots and the repositories are compatible… #1

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2 changes: 2 additions & 0 deletions _tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md
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Expand Up @@ -449,6 +449,8 @@ We recommend ceasing write requests to a cluster before restoring from a snapsho

Snapshots are only forward-compatible by one major version. If you have an old snapshot, you can sometimes restore it into an intermediate cluster, reindex all indexes, take a new snapshot, and repeat until you arrive at your desired version, but you might find it easier to just manually index your data in the new cluster.

Older-version snapshots and the repositories that contain them continue to be compatible with older versions of OpenSearch. If you have a repository containing snapshots taken by an old version, you then upgrade to another version and snapshots are taken after that as well. The old snapshots can be restored to a new cluster running the same version.

## Security considerations

If you're using the Security plugin, snapshots have some additional restrictions:
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