title: Is MongoDB a valid alternative to relational db + lucene?
body: <p>On a new project I need a hard use of lucene for a searcher implementation. This searcher will be a very important (and big) piece of the project. Is valid or convenient replacing Relational Database + Lucene with <a href="http://www.mongodb.org/display/DOCS/Home" rel="noreferrer">MongoDb</a>?</p>
  
  <p>edit: Ok, I will clarify: I'm not asking about risk, I can pay that price in this project. My point is: Is MongoDB oriented to this kind of thing? Can I make a full search engine with the same perfomance as I can get on Lucene?. A friend point me out MongoDB as alternative, but I don't see if the Lucene performance comes with the document alternative (and then, I will see it in MongoDB too), or, in other hand, the inverted index and optimitizations are complety independant of document orientation.</p>