final List<String> tags = new ArrayList<>();
            final List<String> roles = new ArrayList<>();

            for (final Pair<String, String> searchFieldLog : searchLog.getSearchFieldLogList()) {
                final String name = searchFieldLog.getFirst();
                if (contentFieldNameSet.contains(name)) {
                    if (sb.length() > 0) {
                        sb.append(TEXT_SEP);

                    appendJson("requested-at", entity.getRequestedAt(), buf).append(',');
                    final Map<String, List<String>> searchFieldMap = entity.getSearchFieldLogList().stream()
                            .collect(Collectors.groupingBy(Pair::getFirst, Collectors.mapping(Pair::getSecond, Collectors.toList())));
                    appendJson("search-field", searchFieldMap, buf).append(',');