Kafka/log.go:53 Connected to broker at 10.0.7.65:9092 (unregistered)

[wentao (zhangwentao)]

My metricbeat's version is 7.0.0.When i used Kafka module,i met a problem.Questions are as follows：
2019-06-29T18:28:14.028+0800 INFO pipeline/output.go:105 Connection to backoff(elasticsearch(http://10.130.20.55:9200)) established
2019-06-29T18:28:22.891+0800 INFO kafka/log.go:53 Connected to broker at 10.0.7.65:9092 (unregistered)

2019-06-29T18:28:22.896+0800 INFO kafka/log.go:53 Closed connection to broker 10.0.7.65:9092

2019-06-29T18:28:22.986+0800 INFO kafka/log.go:53 Connected to broker at 10.0.7.65:9092 (unregistered)

2019-06-29T18:28:23.084+0800 INFO kafka/log.go:53 Closed connection to broker 10.0.7.65:9092

2019-06-29T18:28:32.891+0800 INFO kafka/log.go:53 Connected to broker at 10.0.7.65:9092 (unregistered)

2019-06-29T18:28:32.895+0800 INFO kafka/log.go:53 Closed connection to broker 10.0.7.65:9092

2019-06-29T18:28:32.986+0800 INFO kafka/log.go:53 Connected to broker at 10.0.7.65:9092 (unregistered)

2019-06-29T18:28:33.080+0800 INFO kafka/log.go:53 Closed connection to broker 10.0.7.65:9092

and my module.d/kafka.yml config file is:

• module: kafka
  metricsets: ["consumergroup", "partition"]
  period: 10s
  hosts: ["10.0.7.65:9092"]
  enable: true

  client_id: metricbeat
  retries: 3
  backoff: 250ms

  topics:
  #ssl.certificate_authorities: ["/etc/pki/root/ca.pem"]
  #ssl.certificate: "/etc/pki/client/cert.pem"
  #ssl.key: "/etc/pki/client/cert.key"
  #username: ""
  #password: ""

so,where am I wrong?please help me，thanks very very much！！