docs: public static boolean oracleExists(CuratorFramework curator) {
      boolean exists = false;
      try {
        exists = curator.checkExists().forPath(ZookeeperPath.ORACLE_SERVER) != null
            && !curator.getChildren().forPath(ZookeeperPath.ORACLE_SERVER).isEmpty();
      } catch (Exception nne) {
        if (nne instanceof KeeperException.NoNodeException) {
          // you'll do nothing
        } else {
          throw new RuntimeException(nne);
        }
      }
      return exists;
    }