Error: failed to authenticate user

when I am restarting elasticsearch ./bin/elasticsearch.

It gives error:
[2019-09-04T16:53:35,773][INFO ][o.e.x.s.a.AuthenticationService] [elk] Authentication of [elastic] was terminated by realm [reserved] - failed to authenticate user [elastic]

This is due to x-pack that I know but how to resolve this?

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