Is it possible to use [Lucene](http://lucene.apache.org/java/docs/index.html) as full fledged data store (like other(mongo,couch) nosql variants). 

I know there are some limitations like newly updated documents by one indexer will not be shown in other indexer. So we need to restart the indexer to get the updates.

But i stumble upon [solr](http://lucene.apache.org/solr/) lately, it seems these problems are avoided by some kind of snapshot replication.

So i thought i could use lucene as a data store since this also uses same kind of documents(JSON based) used by mongo and couch internally to manage documents, and its proven indexing algorithm fetches the records super fast. 

But i am curious has anybody tried that before..? if not what are reasons not choosing this approach.