Github user zenfenan commented on the issue:
https://github.com/apache/nifi/pull/2056
Pulled it and built it locally. Ran the template attached in
[NIFI-4028](https://issues.apache.org/jira/browse/NIFI-4028) and verified it to
be working as expected. Thanks @pvillard31 @markap14 @mattyb149 Merged to
master. +1---
