UNEXPECTED POOL ERROR but logstash is pushing to Elastic perfectly fine?

Elastic Stack Logstash
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Hi, running Logstash 6.2.4 in docker container with DC/OS marathon.

I have logstash ingesting logs from Kafka and pushing to my cluster perfectly fine!!! But in the logs I see these every few seconds and it also seems to restore every attempt.

[2018-06-15T21:31:48,524][WARN ][logstash.outputs.elasticsearch] UNEXPECTED POOL ERROR {:e=>#<LogStash::Outputs::ElasticSearch::HttpClient::Pool::NoConnectionAvailableError: No Available connections>}
[2018-06-15T21:31:48,525][ERROR][logstash.outputs.elasticsearch] Attempted to send a bulk request to elasticsearch, but no there are no living connections in the connection pool. Perhaps Elasticsearch is unreachable or down? {:error_message=>"No Available connections", :class=>"LogStash::Outputs::ElasticSearch::HttpClient::Pool::NoConnectionAvailableError", :will_retry_in_seconds=>4}
[2018-06-15T21:31:49,768][INFO ][logstash.outputs.elasticsearch] Running health check to see if an Elasticsearch connection is working {:healthcheck_url=>http://esdev.marathon.l4lb.thisdcos.directory:9200/, :path=>"/"}
[2018-06-15T21:31:49,773][WARN ][logstash.outputs.elasticsearch] Restored connection to ES instance {:url=>"http://esdev.marathon.l4lb.thisdcos.directory:9200/"}
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ok so esdev.marathon.l4lb.thisdcos.directory is a load balanced virtual i.p!

I'm guessing it's changing I.P constantly for logstash. So it think it's lost the connection?

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