final String sessionId;
            if (searchLog.getUserSessionId() != null) {
                sessionId = searchLog.getUserSessionId();
            } else if (Constants.SEARCH_LOG_ACCESS_TYPE_WEB.equals(searchLog.getAccessType())) {
                sessionId = searchLog.getClientIp();
            } else {
                sessionId = searchLog.getClientIp() + '_' + searchLog.getSearchWord();
            }

                    appendJson("user-agent", entity.getUserAgent(), buf).append(',');
                    appendJson("client-ip", entity.getClientIp(), buf).append(',');
                    appendJson("access-type", entity.getAccessType(), buf).append(',');
                    appendJson("query-time", entity.getQueryTime(), buf).append(',');
                    appendJson("response-time", entity.getResponseTime(), buf).append(',');

            params.put("Query ID", e.getQueryId());
            params.put("User Info ID", e.getUserInfoId());
            params.put("User Session ID", e.getUserSessionId());
            params.put("Access Type", e.getAccessType());
            params.put("Search Word", e.getSearchWord());
            params.put("Requested Time", FessFunctions.formatDate(e.getRequestedAt()));
            params.put("Query Time", toNumberString(e.getQueryTime()));