public void setDefaultConcurrency(int defaultConcurrency) {
		this.defaultConcurrency = defaultConcurrency;
	}
Set the default concurrency for this bus; can be overridden with consumer 'concurrency' property.
@param defaultConcurrency
spring-xd-messagebus-spi/src/main/java/org/springframework/xd/dirt/integration/bus/MessageBusSupport.java