@DSan    You run in to some unique challenges with your specific use case since the properties you want to enable NEL expect Java regular expressions.  The reserved characters that would tell NiFi that a NEL statement is being used are special characters in Java Regular expressions. You may want to raise your change/improvement request as a Jira in the Apache NiFi Jira project: https://issues.apache.org/jira/browse/NIFI There may be others in the community that like this idea and have suggestions for working around the challenge I shared above. If you found this response assisted with your query, please take a moment to login and click on "Accept as Solution" below this post. Thank you, Matt ... View more