This file is indexed.

/etc/libvirt/nwfilter/no-mac-broadcast.xml is in libvirt-bin 1.3.1-1ubuntu10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<filter name='no-mac-broadcast' chain='ipv4'>
    <!-- drop if destination mac is bcast mac addr. -->
    <rule action='drop' direction='out'>
        <mac dstmacaddr='ff:ff:ff:ff:ff:ff' />
    </rule>

    <!-- not doing anything with receiving side ... -->
</filter>