Mark Payne created NIFI-3786:
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             Summary: Allow changing references of a Controller Service from 
Service A to Service B
                 Key: NIFI-3786
                 URL: https://issues.apache.org/jira/browse/NIFI-3786
             Project: Apache NiFi
          Issue Type: Sub-task
          Components: Core UI
            Reporter: Mark Payne
            Priority: Minor


When I have many Processors referencing Service A, I would like to be able to 
configure Service A, see the components that reference it (already available), 
and then indicate that I want those components to instead reference Service B.

This would require that Service A and Service B both implement the same 
Controller Service Interface (actually, all of the Controller Service 
Interfaces that are being referenced by those components).

A use case for such a capability: We have CSV data coming in from some source. 
That is then changed to be JSON data, so I no longer want the CSVReader to be 
used but instead want a JSONReader to be used for reading the incoming data.



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