public void setDefaultReplicationFactor(int defaultReplicationFactor) {
		this.defaultReplicationFactor = defaultReplicationFactor;
	}
Allowed chars are ASCII alphanumerics, '.', '_' and '-'. '_' is used as escaped char in the form '_xx' where xx
is the hexadecimal value of the byte(s) needed to represent an illegal char in utf8.
spring-xd-messagebus-kafka/src/main/java/org/springframework/xd/dirt/integration/kafka/KafkaMessageBus.java