This file is indexed.

/etc/apt/apt.conf.d/50command-not-found is in command-not-found 18.04.4.

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 provided by command-not-found(1) to download
## Commands metadata files.

Acquire::IndexTargets {
    # The deb822 metadata files
    deb::CNF  {
        MetaKey "$(COMPONENT)/cnf/Commands-$(NATIVE_ARCHITECTURE)";
        ShortDescription "Commands-$(NATIVE_ARCHITECTURE)";
        Description "$(RELEASE)/$(COMPONENT) $(NATIVE_ARCHITECTURE) c-n-f Metadata";
    };
};

# Refresh AppStream cache when APT's cache is updated (i.e. apt update)
APT::Update::Post-Invoke-Success {
    "if /usr/bin/test -w /var/lib/command-not-found/ -a -e /usr/lib/cnf-update-db; then /usr/lib/cnf-update-db > /dev/null; fi";
};