code: def drop_indexes(self):
          
          self.__database.client._purge_index(self.__database.name, self.__name)
          self.drop_index("*")
docs: Drops all indexes on this collection.
  
          Can be used on non-existant collections or collections with no indexes.
          Raises OperationFailure on an error.
  
          .. note:: The :attr:`~pymongo.collection.Collection.write_concern` of
             this collection is automatically applied to this operation when using
             MongoDB >= 3.4.
  
          .. versionchanged:: 3.4
             Apply this collection's write concern automatically to this operation
             when connected to MongoDB >= 3.4.