[Dovecot] re-indexing moved mail

I have a huge block of email that was misdelivered into the wrong folder. Moving it where it should be is not just all from one folder to being all of another folder. Basically, the index files need to be rebuilt. Looking in the wiki I cannot find how to do this. It all seems to be about installation, and no administrative tools.

Or would it be just as simple as delete certain index files and they would be automagically rebuilt?

-- sHiFt HaPpEnS!