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With Linux the best option it's to use recoll to create a database and a GUI to search into your documents.

yep on linux have to use catfish file search

Locate works great.

Locate is for file names, not file contents.

ripgrep for contents

ripgrep is fast for what it is. But indexes are faster.

Additionally, I would expect indexing to extract text contents from non-plain-text formats. (such as Recoll does)

How's its GUI? you know, because I was talking about GUI based file searching.