Github user JPercivall commented on the issue:
https://github.com/apache/nifi/pull/571
Yup let's make another ticket for the documentation and just address what
was already merged into 0.x
+1
Visually verified code and did a contrib check build. In standalone and a
secure cluster I used the below template (rename to xml) to test various levels
of the EL access and all performed as expected. Thanks @YolandaMDavis, I will
merge it in.
[Variable_Registry_test.txt](https://github.com/apache/nifi/files/391396/Variable_Registry_test.txt)
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