We are playing with this GE from a while and we found that there is not a quick way to delete/modify a single event sink.
What to do then?
We found two ways, but both require additional operations:
1) reset the full chain of CEP app with "/admin/espr4fastdata" REST call, but this requires to registrate again all the event types, statements etc.
2) delete the related statement, recreate it and recreate the event sink