This file is indexed.

/etc/bash_completion.d/debconf is in debconf 1.5.42ubuntu1.

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

The actual contents of the file can be viewed below.

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have debconf-show &&
_debconf_show()
{
        local cur

        COMPREPLY=()
        cur=${COMP_WORDS[COMP_CWORD]}
        COMPREPLY=($( compgen -W '--listowners --listdbs --db=' -- $cur ) \
                        $( apt-cache pkgnames -- $cur ) )
}
complete -F _debconf_show debconf-show