@AssertTrue(message = "requestRequiredAck can have values 0, 1 or -1")
	public boolean isRequestRequiredAckValid() {
		return (this.requestRequiredAck >= -1) && (this.requestRequiredAck <= 1);
	}
Module options for Kafka Producer configuration.

@author Ilayaperumal Gopinathan
@author Marius Bogoevici
extensions/spring-xd-extension-kafka/src/main/java/org/springframework/integration/x/kafka/KafkaProducerOptionsMixin.java