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 "by_productGroup": {           "map": "function(doc) { if(doc.productGroup) {emit(doc.productGroup, doc._id)} }"       },{   "_id": "WOL-4711",   "_rev": "1-ea81d94de0fbe0f48c8d1dec7add7f9b",   "productGroup": "WOL",   "prefix": "WI",   "color": "676",   "base": "expensive",   "origBase": 3,   "foo": 24,   "bar": 28,   "baz": 60}