For API users it looked like any properties could be searched. But it
turned out to be a hand picked list of properties that we index and then
use for the search. To prevent application errors where special props
are not found, I suggest we document and type the allowed values.
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>
Andy Scherzinger
Côme Chilliet
Christoph Wurst
Anna Larch