How to create custom Searchable Trees? Issue with doc example (Umbraco 15.4.4)

Questions
1

Umbraco 15.4.4

Hi everyone. Maybe somebody knows how to create custom Searchable Trees? Ive tried to use example from this doc: Searchable Trees (ISearchableTree) | 15.latest | Umbraco CMS
But as I found Umbraco.Cms.Core does not contain Trees (Umbraco.Cms.Core.Trees) and as a result coudnt find ISearchableTree and EntitySearchResults. The document appears to be outdated, or not?
Maybe I missed something? I would be happy for any help.

Thanks!

Main idea is to extend the search in backoffice by adding new search sections. Articles for example.

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2

I have the same issue and can’t see any documentation regarding it like we have with ISearchableTree.

Want to extend the search to look also in another data source.

Any help would be appreciated.