code: func NewNamespaceKeyedIndexerAndReflector(lw ListerWatcher, expectedType interface{}, resyncPeriod time.Duration) (indexer Indexer, reflector *Reflector) {
  	indexer = NewIndexer(MetaNamespaceKeyFunc, Indexers{"namespace": MetaNamespaceIndexFunc})
  	reflector = NewReflector(lw, expectedType, indexer, resyncPeriod)
  	return indexer, reflector
  }
docs: // NewNamespaceKeyedIndexerAndReflector creates an Indexer and a Reflector
  // The indexer is configured to key on namespace