Elasticsearch-view-plugin error

gistfile1.sh

# index one document
curl -XPUT 'http://localhost:9200/index_test/type_test/1' -d '{
    "name": "luiz"
}'

# create one view
curl -XPUT 'http://localhost:9200/index_test/type_test/_mapping' -d '
{
    "type_test": {
        "_meta": {
            "views": {
                "default": {
                    "view_lang": "mvel",
                    "content_type": "application/json",
                    "view": "{\"new_name\": \"@{_source.name}\"}"
                }
            }
        }
    }
}'

# render the view
curl -XGET 'http://localhost:9200/_view/index_test/type_test/1'


#exception
[2014-03-06 22:21:24,406][DEBUG][action.view              ] [host1] [index_test][0]: failed to execute [org.elasticsearch.action.view.ViewRequest@2a6ffce4]
org.elasticsearch.transport.RemoteTransportException: [host1][inet[/10.2.2.2:9300]][view/s]
Caused by: java.lang.NullPointerException
	at org.apache.lucene.util.BytesRef.copyChars(BytesRef.java:95)
	at org.apache.lucene.util.BytesRef.<init>(BytesRef.java:84)
	at org.elasticsearch.index.mapper.Uid.createUidAsBytes(Uid.java:121)
	at org.elasticsearch.index.get.ShardGetService.innerGet(ShardGetService.java:151)
	at org.elasticsearch.index.get.ShardGetService.get(ShardGetService.java:101)
	at org.elasticsearch.action.view.TransportViewAction.shardOperation(TransportViewAction.java:121)
	at org.elasticsearch.action.view.TransportViewAction.shardOperation(TransportViewAction.java:1)
	at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$ShardTransportHandler.messageReceived(TransportShardSingleOperationAction.java:257)
	at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$ShardTransportHandler.messageReceived(TransportShardSingleOperationAction.java:243)
	at org.elasticsearch.transport.netty.MessageChannelHandler$RequestHandler.run(MessageChannelHandler.java:269)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:722)