Just an idea, but in my case I have static collection of 20 repositories and other 60 repos that are using different branches in different cases. I wonder how tricky it would be to be separate index process from UI and allowing UI to tap to more than one index.

So I would end up with multiple indexers working with their set of repos and UI that can query against content provided by multiple of them.

It would also help with reindexing I guess, as I could run second indexing service to prepare new indexes, and when its done just update UI configuration, while up to now I have to run second application in local mode, then when its ready stop them and swap their configs. this change would introduce no downtime requirement