This file is indexed.

/usr/share/dbus-1/services/org.gnome.evolution.dataserver.Sources.service is in evolution-data-server-common 3.10.4-0ubuntu1.6.

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.evolution.dataserver.Sources2
Exec=/usr/lib/evolution/evolution-source-registry