This file is indexed.

/usr/share/upstart/sessions/indicator-sound.override is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.

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

The actual contents of the file can be viewed below.

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# Ensure that Pulse is up before we are, which we unfortunately can't
# encode in start conditions because we might need to be started more
# than once where Pulse is only started once. This happens in the case
# of the wizard which starts and stops the indicators once and then
# unity restarts them

pre-start script
	for num in $(seq 1 50); do
		[ -S /run/user/`id -u`/pulse/dbus-socket ] && break
		sleep 0.1
	done

	[ -S /run/user/`id -u`/pulse/dbus-socket ] || stop
end script