final SimpleParser queryParser = new SimpleParser(indexMap.keySet(),
indexMap.firstKey(), null);
final Reference2ReferenceMap<Index, Object> index2Parser = new Reference2ReferenceOpenHashMap<>();
queryEngine = new QueryEngine(queryParser, new DocumentIteratorBuilderVisitor(indexMap,
index2Parser, indexMap.get(indexMap.firstKey()),
Query.MAX_STEMMING), indexMap);
queryEngine.score(new Scorer[]{scorer}, new double[]{1});