Indefiniteness may evoke abundance. The source discusses Arabic expressions of livestock and wealth in which an indefinite term can suggest substantial possessions or quantities.
«لَهُ إِبِلٌ» — He has camels.
«لَهُ غَنَمٌ» — He has sheep or a flock.
The numeral need not be supplied explicitly. If the setting celebrates someone's resources, an indefinite expression can suggest abundance. But an indefinite plural or collective noun does not invariably mean “a great many”; contextual support is required.