Kibana-加入文档以在仪表板中使用

Question

我的Elasticsearch中有以下两个文档：

第一：

{
  "_index": "logs",
  "_type": "_doc",
  "_id": "57ac3ac0-fbdd-11e9-b7f3-1fb58bbc936f",
  "_version": 1,
  "_score": 0,
  "_source": {
    "id": "57ac3ac0-fbdd-11e9-b7f3-1fb58bbc936f",
    "clientId": "1511",
    "host": "worker_4.api-network-driver",
    "startTime": "2019-10-31T12:52:48.876Z",
    "transactionId": "57ab7770-fbdd-11e9-b7f3-1fb58bbc936f"
  },
  "fields": {
    "startTime": [
      "2019-10-31T12:52:48.876Z"
    ]
  }
}

第二

{
  "_index": "logs",
  "_type": "_doc",
  "_id": "5bb8e960-fbdd-11e9-b7f3-1fb58bbc936f",
  "_version": 1,
  "_score": 0,
  "_source": {
    "id": "5bb8e960-fbdd-11e9-b7f3-1fb58bbc936f",
    "clientId": "1511",
    "host": "worker_4.api-network-driver",
    "transactionId": "57ab7770-fbdd-11e9-b7f3-1fb58bbc936f",
    "endTime": "2019-10-31T12:52:55.670Z"
  },
  "fields": {
    "endTime": [
      "2019-10-31T12:52:55.670Z"
    ]
  }
}

而且我不知道如何在Kibana中加入这两个文档（使用transactionId做到这一点）并用单杠表示，从而使startTime和endTime之间的差异以秒为单位。