public void updateEventHandler(EventHandler eventHandler) {
        Preconditions.checkNotNull(eventHandler, "Event handler definition cannot be null");
        stub.updateEventHandler(
                EventServicePb.UpdateEventHandlerRequest.newBuilder()
                        .setHandler(protoMapper.toProto(eventHandler))
                        .build());
    }
Updates an existing event handler

@param eventHandler the event handler to be updated
grpc-client/src/main/java/com/netflix/conductor/client/grpc/EventClient.java