Suppose I have made an index to be immutable . Is it possible to make a snapshot of it?. Also if no, what is the best practices when dealing with the backing up and restoration operations of immutable indices ?
can you explain what an immutable index is in your definition? Did configure the index to be read-only?
In general: You can snapshot an index, that does not receive any further writes the same as an index that gets written to. The good news about this is the fact, that incremental snapshot do not need to do anything, as there are no changes.