@ModuleOption("when to release messages (SpEL expression against a collection of messages accumulated so far)")
	public void setRelease(String release) {
		this.release = release;
	}
Describes options to the {@code aggregator} processor module.

@author Eric Bottard
spring-xd-dirt/src/main/java/org/springframework/xd/dirt/modules/metadata/AggregatorProcessorModuleOptionsMetadata.java