I get this error in Logstash coming even when the pipeline is working just fine. What could it be?

Elastic Stack Logstash
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[2023-08-10T06:10:02,974][ERROR][logstash.licensechecker.licensereader] Unable to retrieve license information from license server {:message=>"No Available connections"}

[2023-08-10T06:10:06,662][INFO ][logstash.licensechecker.licensereader] Failed to perform request {:message=>"172.19.0.2:9200 failed to respond", :exception=>Manticore::ClientProtocolException, :cause=>#<Java::OrgApacheHttp::NoHttpResponseException: 172.19.0.2:9200 failed to respond>}

[2023-08-10T06:10:06,662][WARN ][logstash.licensechecker.licensereader] Attempted to resurrect connection to dead ES instance, but got an error {:url=>"http://elastic:xxxxxx@172.19.0.2:9200/", :exception=>LogStash::Outputs::ElasticSearch::HttpClient::Pool::HostUnreachableError, :message=>"Elasticsearch Unreachable: [http://172.19.0.2:9200/][Manticore::ClientProtocolException] 172.19.0.2:9200 failed to respond"}

I have a Stack made up with Docker. So far everything works fine but periodically the Logstash pipeline spits these logs.

It is ingesting the data as it is configured (setted up a jdbc to grab postgresql data every 2minutes.) but in the time between the intervals of the schedule these logs keep coming.

Any idea of where I should look for more info on it?

Thanks in advance.

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