Unknown 400 error from Elasticsearch null | ssl magento

When elasticsearch is in ssl, one must add https:// before hostname in the admin.

Bonus Nginx config


location  = / {

    allow xx.xx.xx.xx/xx; #magento backend ip
    deny all;
                              
	proxy_pass   http://localhost:9200/;
	proxy_http_version 1.1;
	proxy_set_header Host $host;
	proxy_cache_bypass $http_upgrade;
                                             
}