Github user alopresto commented on the issue:
https://github.com/apache/nifi/pull/1143
Built with `contrib-check` and verified all tests pass. I started the
application, and used an `ExecuteProcess` processor with command `cd` and
arguments `non-existent-dir`. With `Redirect Error Stream` set to **false**
(default), the errors appeared as bulletins. With `Redirect Error Stream` set
to **true**, no bulletins were raised, and the error message was found in the
resulting flowfile contents.
+1, merging.
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