Indexing a multilingual site with automatic language detection?

Question

Search Engine Optimization

There is a site - example.com. The site has been translated into several languages: example.com/ru, example.com/en, example.com/es. The language is detected automatically, after which the user is redirected to the appropriate language version.
When going to example.com, the Russian-speaking user is redirected to example.com/ru, when going to example.com/en/page, it is redirected to example.com/ru/page.
Problem with indexing pages other than the English version. When crawling the page example.com/ru, google bot crawls example.com/en.
How to make google index all language versions correctly without disabling automatic language detection on the site?

Answer 1

automatically redirects the user

If you redirect from example.com /en to example.com/ru, then this is bad. Because the user on example.com/en obviously wants to read the English version, since he is at this address. The redirection from the main page was still all right, and then the choice was made (by you or the user) and it’s not nice to change it.
Actually, in any language of the site there should be a language switcher. That is, the user should always have the choice to change the language, even if it is a barely noticeable button in the footer of the site in small print. So if you didn’t tell the bots where to go, then the bots themselves will guess to look there using the link (again, if you didn’t explicitly forbid them to do so).
PS And don't forget about users without JS. That is, at the root of example.com there must be some kind of language and at least some content. For example, a static language selection menu, but this is already a matter of taste, you can simply display content from / en, such as the default language.

Answer 2

It was rightly said above, add each version to separate sitemaps and monitor their indexing in the Search Console. Well, check the results from different regions through GeoClever. And you can't dictate your terms to Google)