This file is indexed.

/etc/apt/apt.conf.d/60icons-large-hidpi is in apt-config-icons-large-hidpi 0.12.0-3.

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 enables the download of 128x128px icons
## suitable for HiDPI displays for use in software
## centers like GNOME Software and Plasma Discover.

Acquire::IndexTargets {
    deb::DEP-11-icons-hidpi  {
        DefaultEnabled "true";
    };
};