我有一个包含一些嵌套信息的索引，现在正纠结于如何进行查询。
下面的索引代表一辆车，这辆车属于2汽车。

{
    "_index": "items_production_20180411115923024",
    "_type": "item",
    "_id": "1232",
    "_score": 21.715849,
    "_source": {
      "description": "CUBO RODA TRASEIRA VW:GOL, VOYAGE G5/G6 09> C/ABS",
      "observation": null,
      "brand_id": "1 ",
      "product_line_id": "13",
      "line_id": "1",
      "line": "Rolamentos",
      "segment_id": "21",
      "segment": "cubo de roda",
      "application_features": [
        "4 furos"
      ],
      "original_codes": [
        " 5u0 501 611 "
      ],
      "original_brands": [
        "volkswagen"
      ],
      "vehicles": [
        {
          "id": "285",
          "brand": "volkswagen",
          "name": "golf",
          "years": [
            "2009",
            "2010",
            "2011",
            "2012",
            "2013",
            "2014",
            "2015",
            "2016",
            "2017",
            "2018"
          ]
        },
        {
          "id": "345",
          "brand": "volkswagen",
          "name": "jetta",
          "years": [
            "2015",
            "2016",
            "2017",
            "2018"
          ]
        }
      ]
    }
  }

我必须使查询匹配到一个单一的结果时，搜索车型和年份的汽车.即：

GET items_production_20180411115923024/_search
   {
     "query":{
    "bool":{
      "must":{
        "multi_match":{
          "query":"golf 2010",
          "type":"cross_fields",
          "operator":"and",
          "fields":[
            "vehicles.name^8",
            "vehicles.years^8"
          ]
        }
      }
    }
  },
  "size":10,"from":0
}

我必须归还2010年高尔夫球年的所有文件，但我的回答是没有？
我做错了什么？我怎么能做这个查询？