Unable to retrieve version information from Elasticsearch nodes. connect ECONNREFUSED 172.19.0.3:9200

[warkolm (Mark Walkom)]

@Spyros_Agriopoulos

"stacktrace": ["org.elasticsearch.bootstrap.StartupException: java.lang.IllegalStateException: cannot downgrade a node from version [7.16.2] to version [7.15.1]",

That's your problem. You need to be running 7.16.2 or higher.