Github user MikeThomsen commented on the issue:
https://github.com/apache/nifi/pull/2448
I have a ticket open to transition everything in the Mongo space over to
making a client service the source of configurations and connection pooling for
Mongo. So the short term solution would be to copy pasta the abstract base
class into one specifically for GetMongo that does this and just eliminate it
later once all of the connection building is done through the client service
(ie 90% of the base class will be moved over)
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