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See Relevanssi searching settings: there’s a setting whether to restrict the search to the current language or not. That way you can get all languages in the results.
It’s also possible to index cross-language content for each post, but that will lead to duplicates in the results, so I don’t recommend that.
i’m aware of the search settings.
how do you index cross-language content for each post ?
You can use the relevanssi_content_to_index filter hook to add any content to the post as it’s being indexed. Add a filter function that finds the matching post in the other language, fetch all the content from that post you want to include and add it.