code: public final Group updateGroup(Group group) {
  
      UpdateGroupRequest request = UpdateGroupRequest.newBuilder().setGroup(group).build();
      return updateGroup(request);
    }
docs: Updates an existing group. You can change any group attributes except `name`.
  
  <p>Sample code:
  
  <pre><code>
  try (GroupServiceClient groupServiceClient = GroupServiceClient.create()) {
  Group group = Group.newBuilder().build();
  Group response = groupServiceClient.updateGroup(group);
  }
  </code></pre>
  
  @param group The new definition of the group. All fields of the existing group, excepting
  `name`, are replaced with the corresponding fields of this group.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails