重新启动/完成/停止流时出现问题旧使用者未死亡/关闭：

[INFO ] a.a.RepointableActorRef -
  Message [akka.kafka.KafkaConsumerActor$Internal$Stop$] 
  from Actor[akka://ufo-sightings/deadLetters]
  to Actor[akka://ufo-sightings/system/kafka-consumer-1#1896610594]
  was not delivered. [1] dead letters encountered.

描述我正在构建一个服务，该服务接收来自kafka主题的消息，并通过http请求将消息发送到外部服务。
与外部服务的连接可能会断开，我的服务需要重试该请求。
此外，如果流中存在错误，则需要重新启动整个流。
最后，有时我不需要流和它对应的kafka消费者，我想关闭整个流
所以我有一条小溪：

Consumer.committableSource(customizedSettings, subscriptions)
  .flatMapConcat(sourceFunction)
  .toMat(Sink.ignore)
  .run

http请求已发送 sourceFunction 我遵循了新文档中新的kafka消费者重启说明

RestartSource.withBackoff(
      minBackoff = 20.seconds,
      maxBackoff = 5.minutes,
      randomFactor = 0.2 ) { () =>
          Consumer.committableSource(customizedSettings, subscriptions)
            .watchTermination() {
                case (consumerControl, streamComplete) =>
                  logger.info(s" Started Watching Kafka consumer id = ${consumer.id} termination: is shutdown: ${consumerControl.isShutdown}, is f completed: ${streamComplete.isCompleted}")
                  consumerControl.isShutdown.map(_ => logger.info(s"Shutdown of consumer finally happened id = ${consumer.id} at ${DateTime.now}"))
                  streamComplete
                    .flatMap { _ =>
                      consumerControl.shutdown().map(_ -> logger.info(s"3.consumer id = ${consumer.id} SHUTDOWN at ${DateTime.now} GRACEFULLY:CLOSED FROM UPSTREAM"))
                    }
                    .recoverWith {
                      case _ =>
                        consumerControl.shutdown().map(_ -> logger.info(s"3.consumer id = ${consumer.id} SHUTDOWN at ${DateTime.now} ERROR:CLOSED FROM UPSTREAM"))
                    }
             }
            .flatMapConcat(sourceFunction)
      }
      .viaMat(KillSwitches.single)(Keep.right)
      .toMat(Sink.ignore)(Keep.left)
      .run

在复杂的akka流中，有一个问题讨论了这个非终止消费者，但是还没有解决方案。
有没有一个解决办法，迫使Kafka消费者终止