[Koha] Updating Zebra index

[Bob Birchall @ Calyx]

What is the correct way to update the zebra indexes?
The koha manual at Appendices/Cron Jobs suggests that rebuild_zebra.pl (
with -z option) should be run every n minutes, however ...
guidance I've received is that using zebraqueue_daemon.pl is the correct
method.
Which is correct?  
If the latter, then the manual needs an update, I think?  Is the rest of the
guidance in the 'Cron Jobs' section of the manual still correct?
Many thanks,

Bob Birchall
CALYX