This file is indexed.

/usr/share/initramfs-tools/conf.d/zfs is in zfs-initramfs 0.6.5.6-0ubuntu8.

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

The actual contents of the file can be viewed below.

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for x in $(cat /proc/cmdline)
do
	case $x in
		root=ZFS=*)
			BOOT=zfs
			;;
	esac
done