This file is indexed.

/usr/share/bash-completion/completions/debi is in devscripts 2.16.2ubuntu3.

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

The actual contents of the file can be viewed below.

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_debc()
{
    local cur
    cur="${COMP_WORDS[COMP_CWORD]}"
    COMPREPLY=($(compgen -f -X '!*.changes' -- "$cur"))
    if echo "$cur" | grep -qs '^[a-z0-9+.-]*$'; then
        COMPREPLY=(${COMPREPLY[@]} $(apt-cache pkgnames -- $cur 2> /dev/null))
    fi
    return 0
}
complete -o dirnames -F _debc debc debi