xapian search for Drupal.

I have a project that will need full text searches over 1000s of document nodes within Drupal. I am worried that the core search in Drupal might not scale well for a large site with a lot of users, so I am looking in to xapian and getting it to work with Drupal.

Does anyone know of any existing work on this, or how to go about doing it? I’ve not installed it yet, so I don’t know how hard it is, but I’d rather work on someone else starting code than write from scratch.

Thanks