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How to fix logstash error Unable to retrieve license information from license server

Once you started your logstash server, you could probably get this kind of error:
Unable to retrieve license information from license server {:message=>"Elasticsearch Unreachable: [http://elasticsearch:9200/][Manticore::ResolutionFailure] elasticsearch"}
[ERROR][logstash.monitoring.internalpipelinesource] Failed to fetch X-Pack information from Elasticsearch. This is likely due to failure to reach a live Elasticsearch cluster.

There is a quick fix, just add XPACK_MONITORING_ENABLED=false in your env variables and this error will disappear.