I don't know, have you? Are you still seeing warnings being logged about not finding the master? Does GET _cluster/health report that both nodes are in the cluster?
By "they don't indicate anything that needs fixing" I didn't mean "nothing needs fixing", just that those specific messages don't indicate anything needs fixing.
Great news. I suggest you remove logger.org.elasticsearch.discovery: TRACE from the config and restart the node since you won't need this extra logging any more.
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