How to pass to "https" on kibana?

Hi,

Please, I want to have : https://x.x.x.x on Kibana , how can I do this please ?

Here is some info on how to get started with that:
https://www.elastic.co/guide/en/kibana/current/production.html#enabling-ssl

I want to use nginx to do this without passing by the x-pack, do you know how ?

You should be able to do it without x-pack security.

If you are using X-Pack Security or a proxy that provides an HTTPS endpoint for Elasticsearch, you can configure Kibana to access Elasticsearch via HTTPS so communications between the Kibana server and Elasticsearch are encrypted.