public Stream<Hit> stream() {
        if (nPostingLists == 0) {
            return Stream.empty();
        }
        return StreamSupport.stream(new PredicateSpliterator(), false);
    }
@return A stream of Hit-objects from a lazy evaluation of the boolean search algorithm.
predicate-search/src/main/java/com/yahoo/search/predicate/index/PredicateSearch.java