Maybe this is only an issue in older versions, but I've seen a few posts about this and no solution other than rolling restarts. I've seen this issue a few times, and have been able to resolve it without restarting all the nodes. You can tun GET /_snapshot/backup/_status to get the details of the …

If you can't delete a "stuck" (In progress/aborted) snapshot

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If you can't delete a "stuck" (In progress/aborted) snapshot