public void ack(AckToken token) {
        try {
            log.log(Level.FINE, () -> "Sending ack " + token.ackObject);
            session.reply((Reply) token.ackObject);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
Creates a message bus visitor destination session.

@param params the parameters for the visitor destination session
@param bus the message bus to use
documentapi/src/main/java/com/yahoo/documentapi/messagebus/MessageBusVisitorDestinationSession.java