index = FSDirectory.open(indexDir);
indexSearcher = new IndexSearcher(DirectoryReader.open(index));
// override default TF/IDF score to ignore multiple appearances
indexSearcher.setSimilarity(new BinarySimilarity());
// run an initial throw-away query just to "prime the pump" for
// the cache, so we can accurately measure performance speed
// per: http://wiki.apache.org/lucene-java/ImproveSearchingSpeed
indexSearcher.search(new AnalyzingQueryParser(Version.LUCENE_4_9, INDEX_NAME.key(),