camelCase topic name not working in file beat

[alihossein]

Hi
I useing filebeat version :

filebeat version 7.8.0 (amd64), libbeat 7.8.0 [f79387d32717d79f689d94fda1ec80b2cf285d30 built 2020-06-14 18:15:37 +0000 UTC]

`
when I use camel case style for the topic name (for example haproxyLogs), I see this message:

2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:291	Kafka publish failed with: circuit breaker is open
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:221	retryer: send unwait signal to consumer
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:225	  done
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:277	finished kafka batch
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:291	Kafka publish failed with: circuit breaker is open
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:221	retryer: send unwait signal to consumer
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:225	  done
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:277	finished kafka batch
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:291	Kafka publish failed with: circuit breaker is open
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:221	retryer: send unwait signal to consumer
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:225	  done
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:277	finished kafka batch
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:291	Kafka publish failed with: circuit breaker is open
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:221	retryer: send unwait signal to consumer
2020-07-07T16:46:03.233+0430	INFO	[publisher]	pipeline/retry.go:225	  done
2020-07-07T16:46:03.233+0430	DEBUG	[kafka]	kafka/client.go:277	finished kafka batch

so I have decided to change the topic name in the config. (I have used haproxylogs instead of haproxyLogs) and it worked and all logs have produced to topic successfully
what is the problem?

It's my Filebeat's config :

#----------------------------- Kafka output --------------------------------
output.kafka:
  # The Kafka hosts
    hosts: ["xxx.xxx.xxx.xxx:9092","yyy.yyy.yyy.yyy:9092", "zzz.zzz.zzz.zzz:9092"]
  # The Kafka topic
    topic: 'haproxylogs'

[botelastic]

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[kaiyan-sheng]

Hello @alihossein, this problem should be fixed in #18640. Thanks for creating this issue!