Older-version snapshots and repositories are guaranteed to work with … (

#7275)

* Older-version snapshots and repositories are guaranteed to work with older versions of OpenSearch

Signed-off-by: tan3-netapp <[email protected]>

* Change the wording

Signed-off-by: tan3-netapp <[email protected]>

* Apply suggestions from code review

Signed-off-by: Naarcha-AWS <[email protected]>

* Update _tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

Signed-off-by: Naarcha-AWS <[email protected]>

* Update _tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

Co-authored-by: Nathan Bower <[email protected]>
Signed-off-by: tan3-netapp <[email protected]>

* Update _tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

Co-authored-by: Nathan Bower <[email protected]>
Signed-off-by: tan3-netapp <[email protected]>

* Add again the part where the 2.11 snapshots can be restored to 2.11 clusters to emphasize

Signed-off-by: tan3-netapp <[email protected]>

* Update _tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

Co-authored-by: Nathan Bower <[email protected]>
Signed-off-by: tan3-netapp <[email protected]>

---------

Signed-off-by: tan3-netapp <[email protected]>
Signed-off-by: Naarcha-AWS <[email protected]>
Co-authored-by: Naarcha-AWS <[email protected]>
Co-authored-by: Nathan Bower <[email protected]>
(cherry picked from commit 5ef5170)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

_tuning-your-cluster/availability-and-recovery/snapshots/snapshot-restore.md

@@ -447,7 +447,9 @@ We recommend ceasing write requests to a cluster before restoring from a snapsho
 1. A write request to the now-deleted alias creates a new index with the same name as the alias.
 1. The alias from the snapshot fails to restore due to a naming conflict with the new index.
 
-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.
+Snapshots are only forward compatible by one major version. Snapshots taken by earlier OpenSearch versions can continue to be restored by the version of OpenSearch that originally took the snapshot, even after a version upgrade. For example, a snapshot taken by OpenSearch 2.11 or earlier can continue to be restored by a 2.11 cluster even after upgrading to 2.12.
+
+If you have an old snapshot taken from an earlier major OpenSearch version, you can restore it to an intermediate cluster one major version newer than the snapshot's version, reindex all indexes, take a new snapshot, and repeat until you arrive at your desired major version, but you may find it easier to manually index your data in the new cluster.
 
 ## Security considerations