FTS on shared/virtual folders

A question on how FTS is implemented with regards to shared & virtual mailbox. In particular - with Solr. Does Dovecot treat each shared and virtual mailbox as completely independent - which means Solr would reindex each appearance independently?

If that's the case, has any thought been given to potentially identifying such queries and passing them to Solr against the "native" or private mailboxes that are referenced?

-- Daniel