Github user markap14 commented on the issue: https://github.com/apache/nifi/pull/2205 @pvillard31 thanks for the update! I made a couple of very minor tweaks to verbiage (expanded the term "registry" to "variable registry" in the docs for clarification, and expanded the method name on the dto from "scopeEl" to "ExpressionLanguageScope" for getter/setter). Otherwise, all looks great. Many thanks for tackling this task! It's far from trivial and everything works great! Code looks great, definitely a very welcome improvement to the usability! +1 merged to master.