Setup cluster for multiple subscriptions [Azure]

[yellow1912]

I currently have machines in more than 1 subscriptions connecting via VirtualNetwork.
As of now this plugin seems to support only 1 single subscription so it would be nice if it does allow a collection of subscription instead

Issue from old plugin repo:
elastic/elasticsearch-cloud-azure#106

[dadoonet]

Just to be sure. It's for discovery, right? Not for snapshot and restore? I mean that azure repositories already allow multiple accounts.

[DaveCTurner]

Since #19186 deprecates the discovery-azure plugin, I think this can be closed. Something to bear in mind when working on the new ARM-based discovery.

[DaveCTurner]

(Linking #19146)