SEO for aliases in migrated site

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I am migrating a non-Hugo site to Hugo, and moved everything to an subdirectory inside my content, which I called archive (or perhaps old).

I have created an alias for every old page so that the original URL redirects to /archive/ + the original URL.

I see a link rel="canonical" and a noindex get generated, apart from the actual meta http-equiv redirect, as stated in the documentation

I see Google has some documentation on canonical URLs. But I don’t think it says what would happen to existing URLs which would get un-canonicalized. What would happen to them in the search results?

  1. Would they just disappear?
  2. Would they get replaced with their canonical variants?
  3. Something else?
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