我正在建立一个Kafka消费者。我已经设置了类似于下面的恢复回调。我已启用手动提交。如何在恢复回调方法中确认消息，以便没有延迟。

@Bean
    public ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> kafkaListenerContainerFactory() {
        ConcurrentKafkaListenerContainerFactory<String, Map<String, Object>> factory = new ConcurrentKafkaListenerContainerFactory<>();
        factory.setConcurrency(conncurrency);
        factory.setConsumerFactory(consumerFactory());
        factory.setRetryTemplate(retryTemplate());
                factory.setRecoveryCallback(new RecoveryCallback<Object>() {
        @Override
        public Object recover(RetryContext context) throws Exception {
            // TODO Auto-generated method stub
            logger.debug(" In recovery callback method !!");
            return null;
        }
    });
        factory.getContainerProperties().setAckMode(AckMode.MANUAL);
        return factory;
    }

    /*
     * Retry template.
     */

    protected RetryPolicy retryPolicy() {
        SimpleRetryPolicy policy = new SimpleRetryPolicy(maxRetryAttempts, retryableExceptions);
        return policy;
    }

    protected BackOffPolicy backOffPolicy() {
        ExponentialBackOffPolicy policy = new ExponentialBackOffPolicy();
        policy.setInitialInterval(initialRetryInterval);
        policy.setMultiplier(retryMultiplier);
        return policy;
    }

    protected RetryTemplate retryTemplate() {
       RetryTemplate template = new RetryTemplate();
       template.setRetryPolicy(retryPolicy());
       template.setBackOffPolicy(backOffPolicy());
       return template;
    }
}