Elasticsearch java api 怎么添加同级聚合？

聚合语句：
"aggs": {
    "users": {
      "terms": {
        "size": 5000,
        "field": "userId"
      },
      "aggs": {
        "resourceIds": {
          "cardinality": {
            "field": "resourceId"
          }
        }
      }
    },
    "read_count": {
      "sum_bucket": {
        "buckets_path": "users>resourceIds.value"
      }
    },
    "user_count": {
      "cardinality": {
        "field": "userId"
      }
    },
    "read_time": {
      "sum": {
        "field": "duration"
      }
    }
  }
==============================================
JAVA api
TermsAggregationBuilder ab = AggregationBuilders.terms("users").field("userId").size(5000)
                .subAggregation(AggregationBuilders.cardinality("resourceIds").field("resourceId"))
                .subAggregation(new SumBucketPipelineAggregationBuilder("read_count", "users>resourceIds.value"))
                .subAggregation(AggregationBuilders.cardinality("user_count").field("userId"))
                .subAggregation(AggregationBuilders.sum("read_time").field("duration"));
 
请问这个api只能添加subAggregation，请问怎么添加同级的聚合？
因为read_count、user_count、read_time与users处于同一等级