This file is indexed.

/usr/share/dbus-1/services/org.gnome.Calendar.service is in gnome-calendar 3.20.1-1ubuntu1.

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

The actual contents of the file can be viewed below.

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[D-BUS Service]
Name=org.gnome.Calendar
Exec=/usr/bin/gnome-calendar --gapplication-service