If that doesn't help: are you sure you're using Lucene the right way, e.g. having only one IndexReader/Searcher and using it for all searches?
That's my first suggestion too. Memory consumption should not primarily grow per query, rather per IndexSearcher. You're seeing 80MB of RAM consumed per query over an 6M document index. That sounds plausible if, e.g., you're using a Sort and not re-using a single IndexSearcher. Once you start re-using the IndexSearcher overall consumption should be around 80MB.
Doug
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