This file is indexed.

/usr/share/gnome-shell/search-providers/nautilus-search-provider.ini is in nautilus-data 3.22.3-1+deb9u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Shell Search Provider]
DesktopId=org.gnome.Nautilus.desktop
BusName=org.gnome.Nautilus
ObjectPath=/org/gnome/Nautilus/SearchProvider
Version=2