elasticsearch/elasticsearch — pull request #5095 by kzwang (2014-02-12 05:04:42+00:00)
Title: add failures reason to delete by query response

closes #5093

It will return an array of failures reasons. e.g.
```json
"tweet-36": {
"_shards": {
"total": 5,
"successful": 4,
"failed": 1,
"failures": [
"EsRejectedExecutionException[rejected execution (queue capacity 200) on org.elasticsearch.action.support.replication.TransportShardReplicationOperationAction$AsyncShardOperationAction$1@34d7cf5d]"
]
}
}
```