I am trying to setup a parent child relationship and I can't seem to get the mapping config right. I'm using Symfony2.5, FOSElastica 3.0.9 and Elasticsearch 1.4.4

Here is the relevent section from my mapping:

```
# fos elastica
fos_elastica:
    clients:
        default: { host: 127.0.0.1, port: 9200 }
    serializer: 
        callback_class: FOS\ElasticaBundle\Serializer\Callback
        serializer: serializer
    indexes:
        index:
            index_name: index_%kernel.environment%
            client: default
            types:
                company:
                    mappings:
                        id: 
                            type: "long"
                        company_name: 
                            type: "string"
                            fields:
                                raw:
                                    type: "string"
                                    index: "analyzed"
                                    index_analyzer: "sortable"
                    persistence:
                        elastica_to_model_transformer:
                            ignore_missing: true
                        driver: orm # orm, mongodb, propel are available
                        model: Alpha\RMSBundle\Entity\Company
                        provider: ~
                        finder: ~
                        listener: ~
                    serializer: 
                        groups: [company]
                job:
                    mappings:
                        id:
                            type: "long"
                        company:
                            type: "object"
                            properties:
                                id:
                                    type: "long"
                    _parent:
                        type: company
                        property: company
                        identifier: id
                    #_routing:
                    #    required: true
                    #    path: company
                    persistence:
                        elastica_to_model_transformer:
                            ignore_missing: true
                        driver: orm # orm, mongodb, propel are available
                        model: Alpha\RMSBundle\Entity\JobOpening
                        provider: ~
                        finder: ~
                        listener: ~
                    serializer: 
                        groups: [job]

```

First I populate company, but when I try to populate job I get the following error:

```
    [Elastica\Exception\ResponseException]                                 
  RoutingMissingException[routing is required for [index_v2]/[job]/[1]]

```

I have tried specifying the routing which is commented out above, but that didn't set the relationship either, I have taken the routing out as it is not mentioned in the docs.
Can anyone see where I am going wrong?