This file is indexed.

/etc/resolvconf/update-libc.d/squid is in squid 3.5.27-1ubuntu1.

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

PATH="/usr/sbin:/usr/bin:/sbin:/bin"

# Make squid aware of changes to resolv.conf
# Avoid reload before /usr is mounted
if [ -d /usr/sbin ] ; then
   invoke-rc.d squid reload || true
fi