我有一个非常简单的索引，Map如下：

PUT /localindex-products
{
  "mappings": {
    "properties": {
      "name": { "type": "text" },
      "sku": { "type": "keyword" },
      "description": { "type": "text" },
      "contextual": {
        "properties": {
          "name": { "type": "text" },
          "value": { "type": "text" }
        }
      },
      "attributes": {
        "type": "nested",
        "properties": {
          "name": { "type": "text" },
          "value": { "type": "text" }
        }
      }
    }
  }
}

所有文档如下所示：

{
    "name" : "Shoes Adidas Falcon Male",
    "sku" : "TUD-0485-001-37",
    "description" : "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Cras ornare posuere dolor, in efficitur leo porttitor consequat. Donec consectetur urna leo, eget condimentum nisi aliquam ut. Phasellus gravida congue purus, non aliquam odio consequat et. Aenean in sollicitudin mi. Vivamus convallis erat sem, at egestas dui convallis non.",
    "contextual" : [
        {
            "name" : "Composition",
            "value" : "Upper: Textile and synthetic. Midsole: EVA. Sole: rubber, reinforced heel."
        },
        {
            "name" : "Warranty",
            "value" : "Against Manufacturing Defect."
        }
    ],
    "attributes" : [
        {
            "name" : "Gender",
            "value" : "Male"
        },
        {
            "name" : "Recommendation",
            "value" : "Walking"
        },
        {
            "name" : "Material",
            "value" : "Synthetic and Textile"
        },
        {
            "name" : "Color",
            "value" : "Black/White"
        },
        {
            "name" : "Size",
            "value" : "37"
        }
    ]
}

现在，我可以通过 attributes.values :

"aggs": {
    "attributes": {
      "nested": {
        "path": "attributes"
      }, 
      "aggs": {
        "values": {
          "terms": {
            "field": "attributes.value",
            "size": 10
          },
          "aggs": {
            "back_to_root": {
              "reverse_nested": {
                "path": "_source"
              }
            }
          }
        }
      }
    }
  }

但是下面的代码返回所有属性值。我想要的是返回按名称聚合的属性。例如，性别>[男，女]，颜色>[黑/白，蓝，绿]，大小>[37，38，39]等等。。。
我该怎么做？