This file is indexed.

/usr/lib/systemd/user/update-notifier-release.path is in update-notifier 3.192.

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=Path trigger for new release of Ubuntu notifications
PartOf=graphical-session.target

[Path]
PathChanged=/var/lib/ubuntu-release-upgrader/release-upgrade-available