The |= doesnt work with default_properties, which is probably a bug.
The long form does work, viz:
"master_property" : {
"id|=" : [
"/people/person/date_of_birth",
"/people/person/height_meters",
"/type/object/guid",
"/common/topic/alias",
"/people/person/weight_kg",
"/type/object/name"
]
},
-jg