使用Pig和EsStorage插件将元组存储为Elasticsearch中的数组

Question

我遇到了将格式EsStorage存储元组存入Elasticsearch的问题。

我们举一个具体的例子：

X: {id: chararray,score: long,answers: {(id: chararray,score: long)}}
(4,385,{(7,287),(7263,48)})

我正在使用以下ESStorage配置：

DEFINE EsStorage org.elasticsearch.hadoop.pig.EsStorage (
              'es.http.timeout= 5m',
              'es.index.auto.create = true',
              'es.mapping.pig.tuple.use.field.names = true',
              'es.nodes = $es_nodes',
              'es.mapping.id = id'
           );

我将这些元组存储起来：

STORE X INTO '$es_index_name/$es_index_type' USING EsStorage;

结果如下：

     {
        "_index": "stackoverflow_test3",
        "_type": "post",
        "_id": "4",
        "_score": 1,
        "_source": {
           "id": "4",
           "score": 385,
           "answers": [
              [
                 {
                    "id": "7",
                    "score": 287
                 }
              ],
              [
                 {
                    "id": "7263",
                    "score": 48
                 }
              ]
          }
    }

我期待有这样的事情：

     {
        "_index": "stackoverflow_test3",
        "_type": "post",
        "_id": "4",
        "_score": 1,
        "_source": {
           "id": "4",
           "score": 385,
           "answers": [
                 {
                    "id": "7",
                    "score": 287
                 },
                 {
                    "id": "7263",
                    "score": 48
                 }
             ]
          }
    }

你知道我怎么能做到这一点？

谢谢