This file is indexed.

/etc/network/if-down.d/resolvconf is in resolvconf 1.79ubuntu10.

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
#
# ifdown hook script for resolvconf
#
# This file is part of the resolvconf package.
#

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

case "$ADDRFAM" in
  inet|inet6) :      ;;
  *)          exit 0 ;;
esac

/sbin/resolvconf -d "${IFACE}.${ADDRFAM}" || :