Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2777
@ottobackwards I think that's overkill because a Map is fine for the main
variables and a Map also works for passing EL output. A major advantage of
using two maps is that the "context" one is not set in stone as @markap14
pointed out and can change as our use changes without breaking much.---
