Comment 12 for bug 1767817

You don't need Nautilus to search documents by content: for that, install gnome-documents. However, there is a bug: if you search documents from Gnome Shell, Gnome Documents will eventually crash and need to be restarted. To get around this bug, you have to disable the functionality from Settings/Search. Thereby, the only way to search documents by content is from Gnome Documents -app.