Github user ijokarumawak commented on the issue:
https://github.com/apache/nifi/pull/2550
@pvillard31 Yes, it's a breaking change. I wrote a comment on the JIRA.
https://issues.apache.org/jira/browse/NIFI-4980?focusedCommentId=16400035&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-16400035
Should we implement some migration code? I was concerning about that, too,
but didn't want to make it to complex for this little change..---
