'Return a list of index fields defined for this domain.
:return: list of IndexFieldStatus objects
:rtype: list of :class:`boto.cloudsearch2.option.IndexFieldStatus`
object'

def get_index_fields(self, field_names=None):

    data = self.layer1.describe_index_fields(self.name, field_names)
    data = data['DescribeIndexFieldsResponse']['DescribeIndexFieldsResult']['IndexFields']
    return [IndexFieldStatus(self, d) for d in data]
