ASF GitHub Bot commented on NIFI-4149:

Github user markap14 commented on the issue:

    @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.

> Indicate if EL is evaluated against FFs or not
> ----------------------------------------------
>                 Key: NIFI-4149
>                 URL: https://issues.apache.org/jira/browse/NIFI-4149
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Core Framework
>            Reporter: Pierre Villard
>            Assignee: Pierre Villard
>            Priority: Major
>             Fix For: 1.7.0
> With the addition of EL in a lot of places to improve SDLC and workflow 
> staging, it becomes important to indicate to users if the expression language 
> enabled on a property will be evaluated against the attributes of incoming 
> flow files or if it will only be evaluated against various variable stores 
> (env variables, variable registry, etc).
> Actually, the expression language (without evaluation against flow files) 
> could be allowed on any property by default, and evaluation against flow 
> files would be what is actually indicated in the UI as we are doing today. 
> Adopting this approach could solve a lot of JIRA/PRs we are seeing to add EL 
> on some specific properties (without evaluation against FFs).
> Having expression language to access external values could make sense on any 
> property for any user. However evaluating the expression language against FFs 
> is clearly a more complex challenge when it comes to session management and 
> such.

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