This file is indexed.

/etc/network/if-up.d/avahi-daemon is in avahi-daemon 0.7-3.1ubuntu1.

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

# Don't run the avahi-daemon unicast local check while bringing up
# the loopback device; it's not necessary until we bring up a real network
# device
[ "$IFACE" != "lo" ] || exit 0
case "$ADDRFAM" in
	inet|inet6) ;;
	*) exit 0 ;;
esac

# If we have an unicast .local domain, we immediately disable avahi to avoid
# conflicts with the multicast IP4LL .local domain
if [ -x /usr/lib/avahi/avahi-daemon-check-dns.sh ] ; then
	exec /usr/lib/avahi/avahi-daemon-check-dns.sh
fi