问elasticsearch过滤器聚合不起作用

EN

就像this文章一样，我不能让过滤器agg工作：

GET files/_search
{
  "query": {
    "match": {
      "words": "sugar"
    }
  },
  "aggs": {
    "xxx": {
      "filters": {
        "filter_list": {
          "errors": {
            "term": {
              "abstract": "error"
            }
          },
          "warnings": {
            "term": {
              "abstract": "warning"
            }
          }
        }
      },
      "aggs": {
        "st": {
          "significant_terms": {
            "field": "abstract"
          }
        }
      }
    }
  }
}

SearchParseException[文件:查询词:糖，从-1，大小-1:解析失败[ xxx: START_OBJECT的未知键: filter_list.]]；}{tIS8uY8nTDil6kWtgsbkQg4: SearchParseException[文件:查询词:糖，从-1，大小-1:解析失败[未能解析源{\n \“查询\”：{\n ] \“匹配”：{\n \“单词\\”：\“糖”}\n }，\n \“filter_list\\”：{\n \"xxx\"：{\n \“筛选器\”：{\n \"filter_list\"：{\n“ \“错误\”：{\n \“术语\”：{\n \“抽象\”：\“错误\”\n }\n }，\n\“警告\”：{\n \“术语\”：{\n \“摘要\”：\“警告\”\n }\n } }\n }，\n \"aggs\"：{\n \"st\"：{\n \"significant_terms\"：{\n \“字段\”：\“抽象\”\n }\n }\n }]；嵌套: SearchParseException[epars: queryword:queryword: from-1，size-1:解析失败[ xxx: filter_list.]中START_OBJECT的未知键]；}]"，状态“：400 }