Authentication of [elastic] was terminated by realm [reserved] - failed to authenticate user [elastic]

I'm trying to get started with follow Install Elasticsearch with Docker | Elasticsearch Reference [6.0] | Elastic, and even though I set initial password with Docker environment variable ELASTIC_PASSWORD and as I start it, I noticed following in logs:

elasticsearch | [2017-12-02T03:42:55,095][INFO ][o.e.x.s.a.AuthenticationService] [770ea4c1e78f] Authentication of [elastic] was terminated by realm [reserved] - failed to authenticate user [elastic]

however, I keep seeing failed attempts of authentication (not mine) as I'm able to login without any issues:

# curl -I http://elastic:MagicWord@0:9200
HTTP/1.1 200 OK
content-type: application/json; charset=UTF-8
content-length: 431

# 

Please advise.

Are you running Kibana, Logstash, Beats, or anything else that is trying to connect to your Elasticsearch?

sorry, I couldn't find at first what was trying to access it, but later on I found

so never mind)

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