docs: public static void executeCommand(String[] args) throws IOException {
  
              OptionParser parser = getParser();
  
              // declare parameters
              String url = null;
  
              // parse command-line input
              OptionSet options = parser.parse(args);
              if(options.has(AdminParserUtils.OPT_HELP)) {
                  printHelp(System.out);
                  return;
              }
  
              // check required options and/or conflicting options
              AdminParserUtils.checkRequired(options, AdminParserUtils.OPT_URL);
  
              // load parameters
              url = (String) options.valueOf(AdminParserUtils.OPT_URL);
  
              // execute command
              AdminClient adminClient = AdminToolUtils.getAdminClient(url);
  
              doMetaCheckVersion(adminClient);
          }