This file is indexed.

/usr/share/dbus-1/system-services/org.debian.AptXapianIndex.service is in apt-xapian-index 0.44ubuntu5.

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.debian.AptXapianIndex
Exec=/usr/share/apt-xapian-index/update-apt-xapian-index-dbus
User=root