ESEARCH multiple folders

[Peter Chiochetti]

FTS-Solr is blazingly fast; yet searching e.g. an archive with 
subfolders still is slow; I learned, that this is a feature/bug of the 
imap protocol. So I'd like to ask:

Does or will dovecot support the "IMAP4 Multimailbox SEARCH Extension" 
specified in RFC 7377?

--
Kind regards
Peter