This file is indexed.

/usr/share/debian-lan-config/fai/config/scripts/DNS_SERVER/30-forwarders is in debian-lan-config 0.19+deb8u1.

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/bash
#
set -e

if [ "$FAI_ACTION" = "install" ] || [ "$CONVERT" = "true" ] ; then
    if [ "$MAINSERVER_IPADDR" != "$GATEWAY" ] ; then
        ## Add gateway as DNS forwarder:
        sed -i -e "/\/\/ forwarders {/i \        forwarders {${GATEWAY};};" $target/etc/bind/named.conf.options
    fi
fi