Github user trkurc commented on the issue:
https://github.com/apache/nifi/pull/1941
@lfrancke - you can find the versioning scheme here:
https://cwiki.apache.org/confluence/display/NIFI/Version+Scheme+and+API+Compatibility
My interpretation would be wait until a major revision (i.e. 2.x) because
this is an extension, and hence part of the NiFi API, and there is paragraph
about issues changing method signatures later in the guide
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