One way would be to create your own Query subclass (similar to TermQuery)
that returned a score of zero for docs below a certain tf threshold. This is
minor clarification: a score of zero is still a match ... the key to
writting custom queries is to "skip" past a document that doesn't meet the
criteria you want and not return any score for it at all.
if you wnat to write a custom query class, start by making sure you
understand all of hte internals of Scoring...
http://lucene.apache.org/java/docs/scoring.html
...at that point the java-user mailing list is probably a better place to
ask questions about the details involved in writing custom Query classes.
-Hoss
