title: Apache Camel - Kafka producer: setting topic name dynamically
body: <p>I have a camel-base application (spring with routes described in XML). I'd like it to be able to route the input messages to an unknown number of kafka topics (based on a configurable matching between filename patterns and topic names) so i cannot create a producer per pattern in advance in the xml file.</p>
  
  <p>Ideally we would be to be able to set the topic in the message header, like the partition id...</p>
  
  <p>Does anyone has a suggestion ?</p>