boostFunctionList.add(new FilterFunctionBuilder(filter, scoreFunction));
    }

    public RescorerBuilder<?>[] getRescorers(final Map<String, Object> params) {
        return queryRescorerList.stream().map(r -> r.evaluate(params)).filter(b -> b != null).toArray(n -> new RescorerBuilder<?>[n]);
    }

    public void addQueryRescorer(final QueryRescorer rescorer) {
        queryRescorerList.add(rescorer);