title: Spring cloud kafka combinaison function
body: <p>With spring cloud, i saw we can define combinaison functions seperated with a pipe. I m wondering if this feature is also available with spring cloud <strong>kafka streams</strong> binder.</p>
  <p>For example :
  spring.cloud.stream.function.definition: upperCase|firstLetterLowerCase</p>
  <p>I didn't find any examples available on that topic (only on Kafka binder). I guess i m missing something :/</p>
  <p>Can you help me ?</p>