elasticsearch - elasticsearch 比较文档并识别差异

Question

这是映射；

{
"mappings" : {
  "properties" : {
    "stationId" : {
      "type" : "keyword"
    },
    "serialNo" : {
      "type" : "text",
      "fields" : {
        "keyword" : {
          "type" : "keyword",
          "ignore_above" : 256
        }
      }
    }}}}

这是我的弹性搜索数据；

{
    "_index" : "index",
    "_type" : "_doc",
    "_id" : "b1597f62-01c0-4902-88b4-37a964a7777c",
    "_score" : 0.0,
    "_source" : {
      "id" : "b1597f62-01c0-4902-88b4-37a964a7777c",
      "stationId" : "06dbb312-05eb-4b0f-50ab-08d7b08d0cc7",
      "serialNo" : "X"
    }
  },
  {
    "_index" : "index",
    "_type" : "_doc",
    "_id" : "4c833117-2d13-4533-a461-db7d3ec2be7f",
    "_score" : 0.0,
    "_source" : {
      "id" : "4c833117-2d13-4533-a461-db7d3ec2be7f",
      "stationId" : "06dbb312-05eb-4b0f-50ab-08d7b08d0cc7",
      "serialNo" : "Y"
    }
  },
  {
    "_index" : "index",
    "_type" : "_doc",
    "_id" : "64d4f99f-7392-4b9f-a182-79f2408976f4",
    "_score" : 0.0,
    "_source" : {
      "id" : "64d4f99f-7392-4b9f-a182-79f2408976f4",
      "stationId" : "27d40749-a0f7-49af-50ac-08d7b08d0cc7",
      "serialNo" : "X"
    }
  }

我想要基于通过入口站进入但不通过出口站的序列号的记录。我只有进出站ID信息。根据上面的数据，X和Y序列号通过入口站，但只有X序列号从出口站出来。所以对我来说，里面的数据数是1，序列号是Y。顺便说一句，我有超过50,000个唯一的序列号。