Update nested document

gistfile1.js

curl -XDELETE localhost:9200/test
curl -XPUT localhost:9200/test -d '{
    "settings": {
        "index.number_of_shards": 1,
        "index.number_of_replicas": 0
    },
    "mappings": {
        "car": {
            "properties": {
                "creators" : {
                    "type": "nested",
                    "properties": {
                        "name": {"type":"string"}
                    }
                }
            }
        }
    }
}
'
curl -XPOST localhost:9200/test/car/1 -d '{
    "creators": [{
        "name": "Steve"
    }]
}
'
echo
curl -XPOST localhost:9200/test/car/1/_update -d '{
    "script" : "ctx._source.creators += new_creator",
    "params" : {
        "new_creator" : {"name": "John"}
    }
}'
echo
curl "localhost:9200/test/car/1?pretty=true"
echo