ot = OptionalThing.empty();
            } else {
                final SortBuilder[] sortBuilders = split(sorts, ",").get(stream -> stream.filter(StringUtil::isNotBlank).map(s -> {
                    final String[] values = s.split(":");
                    if (values.length > 1) {
                        return SortBuilders.fieldSort(values[0]).order("desc".equalsIgnoreCase(values[0]) ? SortOrder.DESC : SortOrder.ASC);

         */
        protected void buildSort(final QueryContext queryContext, final QueryFieldConfig queryFieldConfig, final FessConfig fessConfig) {
            queryContext.sortBuilders().forEach(sortBuilder -> searchRequestBuilder.addSort(sortBuilder));
        }

        /**
         * Builds the rescorer configuration.
         *
         * @param queryHelper the query helper