public void setExecutorKeepAliveSeconds(int executorKeepAliveSeconds) {
		this.executorKeepAliveSeconds = executorKeepAliveSeconds;
	}
Set the {@link ThreadPoolTaskExecutor}} keep alive seconds.
The executor is used for PubSub operations.
@param executorKeepAliveSeconds the keep alive seconds.
spring-xd-messagebus-local/src/main/java/org/springframework/xd/dirt/integration/bus/local/LocalMessageBus.java