Aggregator - Child outputs is not displayed in pipeline layout

  <camelContext xmlns="http://camel.apache.org/schema/spring" trace="false">
    <route id="route2">
        <from uri="activemq:foo"/>
        <aggregate>
            <correlationExpression>
                <language language="header">customerId</language>
            </correlationExpression>
            <completionPredicate>
                <language language="simple"/>
            </completionPredicate>
            <completionTimeout>
                <language language="simple"/>
            </completionTimeout>
            <completionSize>
                <language language="simple"/>
            </completionSize>
            <to uri="log:aggregated"/>
            <to uri="bean:foo"/>
        </aggregate>
    </route>
</camelContext>