code: public static HeliosClient create(final String domain, final String user) {
      return HeliosClient.newBuilder()
          .setDomain(domain)
          .setUser(user)
          .build();
    }
docs: Create a new helios client as a specific user, connecting to a helios master cluster in a
  specific domain.
  
  @param domain The target domain.
  @param user   The user to identify as.
  
  @return A helios client.