Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2765
According to your gist, it cannot find that one method. Running
dependency:tree on the GCP bundle it looks like the API module needs to have
forcibly upgraded to 2.9.X due to a transitive dependency on 2.1.3. I'll tinker
with that in a bit.---
