How to fix url via htaccess?

Question

htaccess

Good afternoon, respected masters of their craft. I need help setting up the htaccess file.

Given.
Link https://sitename.ru/docs.php?lang=en

Need to get it.
Link https://sitename.ru/docs.php
Any page that has ?lang=en in the address bar is replaced (or redirected) to the same string, but without ?lang=en

Current file:

RewriteEngine On

RewriteCond %{ HTTPS} !=on
RewriteRule ^/?(.*) https://%{SERVER_NAME}/$1 [R,L]

RewriteCond %{HTTP_HOST} ^www.sitename.ru$ [NC]
RewriteRule ^(.*)$ https://sitename.ru/$1 [R=301,L]

RewriteCond %{REQUEST_URI} ^(.*)/index.php$
RewriteRule ^(.*)$ %1/ [R=301,L]

RewriteRule ^index\.php$ https://sitename.ru/ [L,R=301]
ErrorDocument 404 https://sitename.ru/404 .php

Answer 1

RewriteCond %{QUERY_STRING} (^|&)lang\=en($|&)
RewriteRule ^(.*)$ /%1? [L,R=301]

GET is not part of the url