This file is indexed.

/lib/systemd/system/cron-update.service is in systemd-cron 1.5.3-1.

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=systemd-cron update units
Documentation=man:systemd.cron(7)

[Service]
Type=oneshot
ExecStartPre=/usr/bin/touch /run/crond.reboot
ExecStart=/bin/sh -c '/bin/systemctl daemon-reload ; sleep 1 ; /bin/systemctl restart cron.target'