if (start == -1) {
            return null;
        }
        start += 3;

        final int end = entryDn.indexOf(',', start);
        final String value = end == -1 ? entryDn.substring(start) : entryDn.substring(start, end);
        if (fessConfig.isLdapGroupNameWithUnderscores()) {
            return replaceWithUnderscores(value);
        }
        return value;
    }

            buf.append(",\"prev_page\":");
            buf.append(escapeJson(prevPage));
            buf.append(",\"start_record_number\":");
            buf.append(startRecordNumber);
            buf.append(",\"end_record_number\":");
            buf.append(escapeJson(endRecordNumber));
            buf.append(",\"page_numbers\":");
            buf.append(escapeJson(pageNumbers));
            buf.append(",\"partial\":");