This file is indexed.

/usr/share/dbus-1/services/org.freedesktop.FileManager1.service is in nautilus 1:3.18.4.is.3.14.3-0ubuntu4.

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.freedesktop.FileManager1
Exec=/usr/bin/nautilus --gapplication-service