As far as I am aware, Elasticsearch does not implement integrity checks for snapshots. If I am not mistaken, Elasticsearch will silently restore restore snapshots partially if, e.g., data of one shard within the snapshot has been corrupted.

It would be an invaluable feature for users if Elasticsearch would store integrity hashes (e.g., for each shard) together with each snapshot. These hashes may then be used to:

• upon restoring a corrupted snapshot: inform the user that a snapshot has been only partially restored due to a corrupt shard
• upon taking a new incremental snapshot: take a new snapshot of any parts that might have been corrupted