Change log:
3b767c3 Upgrade to Spring Data Kay SR9
4d7844e Upgrade Spring Framework, Data, Clients versions
ab6970a GH-753: Close transactional producer on error
1056d3c Upgrade to Gradle 4.9
ece6030 GH-719: Exclude Spring 4.X dependency
a56469b GH-716: Null Payload Doc Improvements
2cd4d9d Javadocs for ContainerProperties constants
40f76f0 Make ContainerProperties constants public