This file is indexed.

/lib/systemd/system/apt-daily.timer is in apt 1.2.10ubuntu1.

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=Daily apt activities

[Timer]
OnCalendar=*-*-* 6,18:00
RandomizedDelaySec=12h
AccuracySec=1h
Persistent=true

[Install]
WantedBy=timers.target