return functionScoreQueryBuilder;
    }

    protected QueryRescorerBuilder buildRescore() {
        return new QueryRescorerBuilder(
                QueryBuilders.functionScoreQuery(ScoreFunctionBuilders.randomFunction().seed(seed).setField("_seq_no"))).setQueryWeight(0)
                .setRescoreQueryWeight(1);
    }

    protected PopularWordsResponse createResponse(final SearchResponse searchResponse) {

            final List<FunctionScoreQueryBuilder.FilterFunctionBuilder> flist = new ArrayList<>();
            flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(ScoreFunctionBuilders.randomFunction()
                    .seed(ComponentUtil.getSystemHelper().getCurrentTimeAsLong()).setField(fessConfig.getIndexFieldDocId())));
            reader.setQuery(QueryBuilders