/usr/share/gnome-shell/search-providers/org.gnome.Calendar.search-provider.ini is in gnome-calendar 3.28.1-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | [Shell Search Provider]
Icon=gnome-calendar
DesktopId=org.gnome.Calendar.desktop
BusName=org.gnome.Calendar
ObjectPath=/org/gnome/Calendar/SearchProvider
Version=2
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