Document taking snapshots of searchable snapshots (#68136)
Document taking snapshots of searchable snapshots (#68136)

Taking a snapshot of a cluster containing searchable snapshot indices is
kind of mindbending. This commit adds docs to indicate that this does
work.

Co-authored-by: James Rodewig <d5d520df3f4564540f208acb32a86e5e141e7431@users.noreply.github.com>
robin13/elasticsearch,robin13/elasticsearch,robin13/elasticsearch,robin13/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch