subsys/kafka/src/main/java/org/commonjava/indy/subsys/kafka/IndyKafkaProducer.java
public void send( String topic, String message, LogbackFormatter formatter ) throws IOException
    {
        doKafkaSend( topic, message, formatter );
    }
public void send( String topic, String message, LogbackFormatter formatter ) throws IOException
    {
        doKafkaSend( topic, message, formatter );
    }
Non-blocking send with a logback formatter to format the message.