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https://issues.apache.org/jira/browse/NIFI-4149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Payne resolved NIFI-4149.
------------------------------
       Resolution: Fixed
    Fix Version/s: 1.7.0

> 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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