Smack 4.0+ does not support message property?

As title described, Smack 4.0+ does not support message property?

Is the property deleted or changed to some where not easy to find ?

Since I did not find this change in change log, I hope that some one could answer this question!

The change is documented at https://github.com/igniterealtime/Smack/wiki/Smack-4.0-Readme-and-Upgrade-Guide