anchor.diff:  
   == URI format
   
  -[source,java]
  +[source,text]
   ---------------------------
   vertx-kafka:topic[?options]
   ---------------------------
  
positive.code: Note: all headers propagated *from* kafka *to* camel exchange will contain `io.vertx.core.buffer.Buffer` value by default.
  
  Having the support of `io.vertx.core.buffer.Buffer` header type, will allow you un-wrap the header to any type without much knowledge in `byte[]`. For example:
  ```
  from("direct")
      .process(exchange -> {
          // set kafka header
  
negative.code:         System.out.println(headerBuffer.getDouble(0); // it will print 2.0
  })
  .to("direct)
  ----
  
  By default all headers are being filtered by `KafkaHeaderFilterStrategy`.
  Strategy filters out headers which start with `Camel` or `org.apache.camel` prefixes.
  