code: public UfsManager.UfsClient getUfsClient(long mountId) {
      try {
        return mUfsManager.get(mountId);
      } catch (NotFoundException | UnavailableException e) {
        LOG.warn("failed to get ufsclient for mountid {}, exception {}", mountId, e);
      }
      return null;
    }
docs: Get the associated ufs client with the mount id.
  @param mountId mount id to look up ufs client
  @return ufsClient