title: Manually releasing Aggregator messages
body: <p>I have a simple use case where I have used Aggregator with MessageCountReleaseStrategy.  At the close of business there are some messages that are 
  stored in message store overnight. Next day after arrival of remaining messages the group gets released.</p>
  
  <p>Now I want to add capability to peek into the messages stored(not released) at end of day and provide an option to release the messages if the user wants to. </p>
  
  <p>Need pointers on how to peek into the messages stored.
  For simplicity of this use case I am considering only 1 Message Group.</p>
  
  <pre><code>&lt;int:aggregator input-channel="orderItem"              output-channel="orders"
                  ref="orderAggregator"                  method="createOrders"
                  expire-groups-upon-completion="true"   release-strategy="messageCountReleaseStrategy" 
                  message-store="messageStore"           discard-channel="aggregatorDiscard" /&gt;
  
  &lt;bean id="messageCountReleaseStrategy" class="org.springframework.integration.aggregator.MessageCountReleaseStrategy"&gt;
      &lt;constructor-arg index="0" value="10"/&gt;
  &lt;/bean&gt; 
  </code></pre>