Getting this failure:

[2011-05-04 16:19:39,401][WARN ][river ]
[Moonstone] failed to get _meta from [testcluster]/[testriver]
org.elasticsearch.action.NoShardAvailableActionException: [_river][0]
No shard available for [testriver#_meta]
at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$AsyncSingleAction.perform(TransportShardSingleOperationAction.java:193)
at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$AsyncSingleAction.performFirst(TransportShardSingleOperationAction.java:159)
at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction$AsyncSingleAction.start(TransportShardSingleOperationAction.java:116)
at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction.doExecute(TransportShardSingleOperationAction.java:69)
at org.elasticsearch.action.support.single.shard.TransportShardSingleOperationAction.doExecute(TransportShardSingleOperationAction.java:45)
at org.elasticsearch.action.support.BaseAction.execute(BaseAction.java:61)
at org.elasticsearch.client.node.NodeClient.get(NodeClient.java:152)
at org.elasticsearch.client.action.get.GetRequestBuilder.doExecute(GetRequestBuilder.java:119)
at org.elasticsearch.client.action.support.BaseRequestBuilder.execute(BaseRequestBuilder.java:56)
at org.elasticsearch.river.RiversService$ApplyRivers.riverClusterChanged(RiversService.java:217)
at org.elasticsearch.river.cluster.RiverClusterService$1.run(RiverClusterService.java:126)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)