/usr/share/dbus-1/services/org.gnome.zeitgeist.Engine.service is in zeitgeist-core 1.0-0.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | [D-BUS Service]
Name=org.gnome.zeitgeist.Engine
Exec=/bin/sh -c "/usr/lib/zeitgeist/zeitgeist/zeitgeist-maybe-vacuum; /usr/bin/zeitgeist-daemon"
SystemdService=zeitgeist.service
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