This day I'm working on MoinMoin.storage.backends.indexing
First I made possible to pass app.cfg.index_dir to ItemIndex at moin start up, so WhooshIndex object now know where is path for indexes.
Next, I implemented some functions like ItemIndex.{close,get_item_id,update_item,remove_item,add_rev,remove_rev}_whoosh which copy functional of original functions, but using whoosh
There is code http://codereview.appspot.com/4650073/ [Patch Set 1]