Github user ottobackwards commented on the issue:
https://github.com/apache/nifi/pull/1925
No. I'm not talking about getting all the groks from the controller and
registering them.
I'm talking about having to setup the controller, and type in a dynamic
property for all the groks required.
The concept that there is one or more groks is wrong in my mind. For every
one of the _user's_ groks, the groks they want to use, there may be a dozen
groks composited in and need to be compiled in to execute them.
Usability wise, entering the dynamic property this way will only work for
the simplest cases.
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