I want to make new ssl certificate and key for elasticsearch

Hello.
I use ubuntu 20.04 version (server) and elasticsearch 8.3.2 version.

Then, I want to make new certification and key for ssl secure elasticsearch. It already set ssl key using 'http.p12'. But i didn't set this. It is default setting. I also have to secure for kibana and logstash. Therefore, i have to get 'crt, key '. I heard that kibana can't use p12 certification.

I try to setting security using this url.

But, I failed. My elasticsearch log said


What is meaning in this logfile?

xpack.security.http.ssl.client_authentication: "none"