Freezer api error with elasticsearch 2.2

[Jonas]

I'm using elasticsearch 2.2.

When trying to start or stop a job I get the following error message in the freezer-api logs:

    2016-03-25 16:08:53,535 root ERROR index operation failed TransportError(400, u'illegal_argument_exception')

A bit of debugging showed that the problem is caused by line 96 in freezer_api.storage.elastic. It causes the following exception:

RequestError(400, u'illegal_argument_exception', {u'status': 400, u'error': {u'root_cause': [{u'reason': u'[Photon][169.254.169.254:9300][indices:data/write/index[p]]', u'type': u'remote_transport_exception'}], u'type': u'illegal_argument_exception', u'reason': u'Field [_version] is defined twice in [jobs]'}})

With elasticsearch 1.7 everything works fine.