This file is indexed.

/usr/lib/systemd/user/dbus.socket is in dbus-user-session 1.10.6-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Unit]
Description=D-Bus User Message Bus Socket

[Socket]
ListenStream=%t/bus
ExecStartPost=-/bin/systemctl --user set-environment DBUS_SESSION_BUS_ADDRESS=unix:path=%t/bus

[Install]
WantedBy=sockets.target
Also=dbus.service