Just want to point out that MongoDB doesn't have full text search perse, but it can do nested array indexes... If you want stubbing/phoneticization you need to do it as part of your input, and part of your search logic... if you front your queries with a service then it is easy enough to do.
Actually, as of 2.4 there is an experimental text search feature built-in: http://docs.mongodb.org/manual/core/text-search/. While it is no Lucene (and is still considered experimental) it does provide simple tokenizing, stop-words and stemming.
