Write a simple Collector (read the javadocs) that has a collect(int
doc) method that does nothing except increment a counter. Use it via
one of the search methods that takes a Collector.
btw TopDocCollector won't load them all in memory, but obviously it
will keep track of the top scoring docs.
I'm not sure what you mean by "loading them all into memory".
I'm pretty sure that the numHits you specify just limits the number
of documents kept in the internal ScoreDocs, and getTotalHits
can easily be much greater than numHits. But that would be
trivial to test (you shouldn't take my word for
