final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String field = getSearchField(context.getDefaultField(), termRangeQuery.getField());

        if (!isSearchField(field)) {
            final StringBuilder queryBuf = new StringBuilder();
            queryBuf.append(termRangeQuery.includesLower() ? '[' : '{');
            final BytesRef lowerTerm = termRangeQuery.getLowerTerm();

            return SortBuilders.scoreSort().order(order);
        }
        return SortBuilders.fieldSort(field).order(order);
    }

    protected boolean isSearchField(final String field) {
        for (final String searchField : getQueryFieldConfig().searchFields) {
            if (searchField.equals(field)) {
                return true;
            }
        }

            return convertWildcardQuery(fessConfig, context, termQuery, boost, field, text);
        }
        if (!isSearchField(field)) {
            final String origQuery = termQuery.toString();
            return convertDefaultTermQuery(fessConfig, context, termQuery, boost, DEFAULT_FIELD, origQuery);
        }