flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(
                ScoreFunctionBuilders.fieldValueFactorFunction(FieldNames.USER_BOOST).missing(1f).setWeight(1.0F)));
        final FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery(queryBuilder,
                flist.toArray(new FunctionScoreQueryBuilder.FilterFunctionBuilder[flist.size()]));

            reader.setLimitOfDocumentSize(fessConfig.getSuggestUpdateContentsLimitDocSizeAsInteger());

            final List<FunctionScoreQueryBuilder.FilterFunctionBuilder> flist = new ArrayList<>();
            flist.add(new FunctionScoreQueryBuilder.FilterFunctionBuilder(ScoreFunctionBuilders.randomFunction()

        }
        final FunctionScoreQueryBuilder functionScoreQueryBuilder = QueryBuilders.functionScoreQuery(queryBuilder,
                ScoreFunctionBuilders.fieldValueFactorFunction(FieldNames.QUERY_FREQ).missing(0));
        functionScoreQueryBuilder.boostMode(CombineFunction.REPLACE);
        return functionScoreQueryBuilder;
    }

    protected QueryRescorerBuilder buildRescore() {

import org.opensearch.index.query.MatchAllQueryBuilder;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder.FilterFunctionBuilder;
import org.opensearch.search.sort.SortBuilder;

public class QueryContext {

    protected static final String ALLINURL_FIELD_PREFIX = "allinurl:";