This file is indexed.

/etc/init/network-interface.conf is in ifupdown 0.8.10ubuntu1.

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

The actual contents of the file can be viewed below.

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# network-interface - configure network device
#
# This service causes network devices to be brought up or down as a result
# of hardware being added or removed, including that which isn't ordinarily
# removable.

description	"configure network device"

emits net-device-up
emits net-device-down
emits static-network-up

start on net-device-added
stop on net-device-removed INTERFACE=$INTERFACE

instance $INTERFACE
export INTERFACE

pre-start script
    if [ "$INTERFACE" = lo ]; then
        # bring this up even if /etc/network/interfaces is broken
        ifconfig lo 127.0.0.1 up || true
        initctl emit -n net-device-up \
            IFACE=lo LOGICAL=lo ADDRFAM=inet METHOD=loopback || true
    fi
    mkdir -p /run/network
    ifup --allow auto $INTERFACE
    ifup --allow hotplug $INTERFACE
end script

post-stop script
    ifdown --force --allow auto $INTERFACE
    ifdown --force --allow hotplug $INTERFACE
end script