I think the search line makes sense ... I tried to explain it in my last comment (http://wiki.linuxfromscratch.org/lfs/ticket/2698#comment:6):
GRUB can boot if the device has changed (for example hd0,1 --> hd1,1) or if a new filesystem was created (--> the UUID has changed).
My suggestion: "With help of the search line, GRUB is able to boot even if the boot device has changed."
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