This file is indexed.

/lib/systemd/system/unattended-upgrades.service is in unattended-upgrades 0.90.

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=Unattended Upgrades Shutdown
DefaultDependencies=no
Before=shutdown.target reboot.target halt.target
Documentation=man:unattended-upgrade(8)

[Service]
Type=oneshot
ExecStart=/usr/share/unattended-upgrades/unattended-upgrade-shutdown

[Install]
WantedBy=shutdown.target