This file is indexed.

/etc/apt/apt.conf.d/10periodic is in update-notifier-common 0.119ubuntu8.1.

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

The actual contents of the file can be viewed below.

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APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";