This file is indexed.

/etc/systemd/network/00-rmnet-kernel.link is in lxc-android-config 0.230+16.04.20160328-0ubuntu1.

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

The actual contents of the file can be viewed below.

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# NOTE: This disables renaming of certain network interfaces we use on
# Ubuntu Touch devices for mobile data connectivity. Those interfaces
# are used by their name elsewhere and can't be easily automatically
# named differently.
#
# This currently affects the following devices:
#
# - Nexus 4 (mako)
# - Nexus 7 2013 (flo) (with mobile support)
#
# However it will be used on other devices as well where the network
# interfaces for mobile data connectivty are prefixed with rmnet_*

[Match]
OriginalName=rmnet_*

[Link]
NamePolicy=kernel
MACAddressPolicy=persistent