/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.
1 2 3 4 | [D-BUS Service]
Name=org.debian.AptXapianIndex
Exec=/usr/share/apt-xapian-index/update-apt-xapian-index-dbus
User=root
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