Is there any way to execute a MoreLikeThis over a subset of documents? I need to retrieve a set of interesting keywords from a subset of documents and not the entire index (imagine that my index has documents categorized as A, B and C and I just want to work with those categorized as A). Right now it is using docFreq from the IndexReader. So I looked into the FilterIndexReader to see if I can override the docFreq behavior, but I'm not sure if it's possible.
What do you think? Jonathan
