public String getSink() {
        return (String) getInput().get(SINK_PARAMETER);
    }
@param taskReferenceName Unique reference name within the workflow
@param eventSink qualified name of the event sink where the message is published. Using the
    format sink_type:location e.g. sqs:sqs_queue_name, amqp_queue:queue_name,
    amqp_exchange:queue_name, nats:queue_name
java-sdk/src/main/java/com/netflix/conductor/sdk/workflow/def/tasks/Event.java