Github user mattyb149 commented on the issue:
https://github.com/apache/nifi/pull/1037
I believe it had to be removed because it uses or has a dependency on
JSON.org-licensed JARs, which was determined to be Category X for the Apache
Software Foundation. It was removed in #1230 under
[NIFI-2991](https://issues.apache.org/jira/browse/NIFI-2991). I encourage you
to change the underlying JSON libraries such that the licensing is
ASF-friendly, then we can review and merge the updated PR.
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