docs: def dropIndex(cls, fields) :
  		"removes an index created with ensureIndex "
  		con = RabaConnection(cls._raba_namespace)
  		rlf, ff = cls._parseIndex(fields)
  		
  		for name in rlf :
  			con.dropIndex(name, 'anchor_raba_id')
  		
  		con.dropIndex(cls.__name__, ff)
  		con.commit()