This file is indexed.

/etc/ppp/ip-down.d/000resolvconf is in resolvconf 1.78ubuntu2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
#
# PPP down hook script for resolvconf
#
# Reconfigures resolver to take into account
# the disappearance of the ppp interface.
#
# This file is part of the resolvconf package.
#

[ -x /sbin/resolvconf ] || exit 0

case "$6" in
  nm-pptp-service-*|nm-l2tp-service-*|/org/freedesktop/NetworkManager/PPP/*)
    # NetworkManager handles it
    exit 0
    ;;
esac

/sbin/resolvconf -d "${PPP_IFACE}.pppd"