Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2723
@markap14 I think your concerns are addressed now.
@ijokarumawak I tried out the expression language APIs and found that I
can't just submit a Map, so I'm going to hold off on providing a dynamic
template URL for now. That could be be a good improvement to add after the
expression language compiler api gets updated to support generic maps as well
(if it ever happens).---
