title: Spring Boot Kafka with MANUAL_IMMEDIATE ack
body: <p>I have a Springboot app. wiuth this configuration:</p>
  
  <pre><code>  kafka:
      consumer:
        listener:
          ack-mode: MANUAL_IMMEDIATE
  </code></pre>
  
  <p>ad this consumer:</p>
  
  <pre><code>@KafkaListener(topics = "test", groupId = "group_id")
      public void consume(String message, Acknowledgment ack) throws IOException {
              ack.acknowledge();
      }
  </code></pre>
  
  <p>but I have this error when receiving a message:</p>
  
  <pre><code>org.springframework.messaging.converter.MessageConversionException: Cannot convert from [java.lang.String] to [org.springframework.kafka.support.Acknowledgment] for GenericMessage 
  </code></pre>