What does this error code means?

[WARN ] 2019-06-07 16:40:35.383 [Ruby-0-Thread-29: :1] elasticsearch - Attempted to resurrect connection to dead ES instance, but got an error. {:url=>"", :error_type=>LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError, :error=>"Got response code '401' contacting Elasticsearch at URL ''"}

The user is not authenticated. That's what an HTTP 401 code means.

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