How to change the username by own instead of elastic?

Elastic Stack Elasticsearch
1

How to change the username by own instead of elastic in ELK?

2

Hi @merson

The built-in elastic username can not be changed, you can add new users and roles as you like.

In fact, you can not change the name of any of the built int users See here

It is pretty easy to set up new users and roles via Kibana see here