I upgraded my Cluster from 1.7.5 to 2.4.2 last week.
Now my backups fail with "state" : "PARTIAL" and some indices failing to backup with
"reason" : "IndexShardSnapshotFailedException[Compressor detection can onl
y be called on some xcontent bytes or compressed xcontent bytes]; nested: NotXCo
ntentException[Compressor detection can only be called on some xcontent bytes or
compressed xcontent bytes]; "
I did not find any helpful discussions on this concerning backups...
I get the same error when i delete old snapshots, though they are deleted from the snapshot list.