This file is indexed.

/etc/apt/apt.conf.d/20packagekit is in packagekit 0.7.2-4ubuntu3.

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

The actual contents of the file can be viewed below.

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// THIS FILE IS USED TO INFORM PACKAGEKIT
// THAT THE UPDATES MIGHT HAVE CHANGED
// Whenever the dpkg is called we might have different updates
// i.e. a user removes a package that had an update
DPkg::Post-Invoke {
"/usr/bin/test -e /usr/share/dbus-1/system-services/org.freedesktop.PackageKit.service && /usr/bin/test -S /var/run/dbus/system_bus_socket && /usr/bin/gdbus call --system --dest org.freedesktop.PackageKit --object-path /org/freedesktop/PackageKit --timeout 1 --method org.freedesktop.PackageKit.StateHasChanged cache-update > /dev/null; /bin/echo > /dev/null";
};

// When the apt cache is updated (i.e. apt-cache update)
APT::Update::Post-Invoke-Success {
"/usr/bin/test -e /usr/share/dbus-1/system-services/org.freedesktop.PackageKit.service && /usr/bin/test -S /var/run/dbus/system_bus_socket && /usr/bin/gdbus call --system --dest org.freedesktop.PackageKit --object-path /org/freedesktop/PackageKit --timeout 1 --method org.freedesktop.PackageKit.StateHasChanged cache-update > /dev/null; /bin/echo > /dev/null";
};