Search Appliance SBE
Syntax: one or more alias host and canonical host pairs
Host Aliases allow you to indicate that one site (the alias host) is a copy of another site (the canonical host), and that the alias host should automatically be translated to the canonical host when indexing.
Any content already indexed on the aliased host will be translated to the canonical host when the next walk is launched.
The hosts are full hostnames, not partial matches. If you want
www.oldhost.com aliased to www.newhost.com and
docs.oldhost.com aliased to docs.newhost.com, they needs to be two
separate host alias pairs.
If a search user specifies an alias host with `site: syntax
(3.6.20 here), it will automatically be translated to
the canonical host.