Github user christophercurrie commented on the issue:
https://github.com/apache/nifi/pull/2140
How smooth their experience will be will probably depend upon their
internal project practices. Since the `nifi-aws-processors` package would have
been a required dependency for such custom processors, the main change would be
to require adding `nifi-aws-service-api-nar` somewhere in their nar parent
chain; this change is, AFAICT, unavoidable given the nature of
controller-processor decoupling.---
