ElasticSearch functional tests fail

Functional tests for ElasticSearch are failling with ES 2.2.3 at least:

{1} ceilometer.tests.functional.api.v2.test_event_scenarios.TestEventAPI.test_get_events_filter_trait_empty_type [1.716037s] ... FAILED

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "ceilometer/tests/base.py", line 89, in skip_if_not_implemented
        return func(*args, **kwargs)
      File "ceilometer/tests/functional/api/v2/test_event_scenarios.py", line 37, in setUp
        self._generate_models()
      File "ceilometer/tests/functional/api/v2/test_event_scenarios.py", line 69, in _generate_models
        self.event_conn.record_events(event_models)
      File "ceilometer/event/storage/impl_elasticsearch.py", line 103, in record_events
        self.conn, _build_bulk_index(events)):
      File "/Users/jd/Source/ceilometer/.tox/py-elastic/lib/python2.7/site-packages/elasticsearch/helpers/__init__.py", line 160, in streaming_bulk
        for result in _process_bulk_chunk(client, bulk_actions, raise_on_exception, raise_on_error, **kwargs):
      File "/Users/jd/Source/ceilometer/.tox/py-elastic/lib/python2.7/site-packages/elasticsearch/helpers/__init__.py", line 132, in _process_bulk_chunk
        raise BulkIndexError('%i document(s) failed to index.' % len(errors), errors)
    elasticsearch.helpers.BulkIndexError: (u'3 document(s) failed to index.', [{u'index': {u'_index': u'events_452edb1ecf8c4a2cb43faa1ec1971b2c_2013-12-31', u'error': {u'caused_by': {u'type': u'mapper_parsing_exception', u'reason': u'Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'type': u'mapper_parsing_exception', u'reason': u'Failed to parse mapping [_default_]: Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'status': 400, u'_type': u'Foo', u'_id': u'0'}}, {u'index': {u'_index': u'events_452edb1ecf8c4a2cb43faa1ec1971b2c_2014-01-01', u'error': {u'caused_by': {u'type': u'mapper_parsing_exception', u'reason': u'Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'type': u'mapper_parsing_exception', u'reason': u'Failed to parse mapping [_default_]: Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'status': 400, u'_type': u'Bar', u'_id': u'100'}}, {u'index': {u'_index': u'events_452edb1ecf8c4a2cb43faa1ec1971b2c_2014-01-02', u'error': {u'caused_by': {u'type': u'mapper_parsing_exception', u'reason': u'Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'type': u'mapper_parsing_exception', u'reason': u'Failed to parse mapping [_default_]: Mapping definition for [_timestamp] has unsupported parameters: [store : true]'}, u'status': 400, u'_type': u'Zoo', u'_id': u'200'}}])