I had an ES cluster of several nodes (let's say es1, es2, ...), and I have a disk snapshot from a certain point in the past, of the disk of a single ES node (i.e. es1).
I'd like to dump all the data from this es1's backup.
I can start a Linux instance (say, esX) from this backup, but the ES instance on esX won't start because it once belonged to a ES cluster.
I don't have backups for es2, es3, ... so I can't start all nodes to build another cluster.
How can I save data from this situation?
My guess is 1) maybe there's some way to force start the ES instance by skipping master discovery or election processes or the likes, or 2) maybe there's some way to dump data from /var/lib/elasticsearch directly, without starting an ES instance itself.
But I can't find any way to do either of these.