logger.debug("url={}", url);
        }
        try (CurlResponse response = Curl.get(url)
                .header("Authorization", "Bearer " + user.getAuthenticationResult().accessToken())
                .header("Accept", "application/json")
                .execute()) {
            final Map<String, Object> contentMap = response.getContent(OpenSearchCurl.jsonParser());

online.help.name.backup=backup
# Online help key for upgrade.
online.help.name.upgrade=upgrade
# Online help key for search request.
online.help.name.sereq=sereq
# Online help key for access token.
online.help.name.accesstoken=accesstoken
# Online help key for suggest.
online.help.name.suggest=suggest
# Online help key for search log.
online.help.name.searchlog=searchlog
# Online help key for maintenance.