{
  "data": [
    {
      "_id": 1,
      "x": 11
    },
    {
      "_id": 2,
      "x": 22
    }
  ],
  "collection_name": "default_write_concern_coll",
  "database_name": "default_write_concern_db",
  "runOn": [
    {
      "minServerVersion": "4.2"
    }
  ],
  "tests": [
    {
      "description": "Aggregate with $merge omits default write concern",
      "operations": [
        {
          "object": "collection",
          "databaseOptions": {
            "writeConcern": {}
          },
          "collectionOptions": {
            "writeConcern": {}
          },
          "name": "aggregate",
          "arguments": {
            "pipeline": [
              {
                "$match": {
                  "_id": {
                    "$gt": 1
                  }
                }
              },
              {
                "$merge": {
                  "into": "other_collection_name"
                }
              }
            ]
          }
        }
      ],
      "expectations": [
        {
          "command_started_event": {
            "command": {
              "aggregate": "default_write_concern_coll",
              "pipeline": [
                {
                  "$match": {
                    "_id": {
                      "$gt": 1
                    }
                  }
                },
                {
                  "$merge": {
                    "into": "other_collection_name"
                  }
                }
              ],
              "writeConcern": null
            }
          }
        }
      ],
      "outcome": {
        "collection": {
          "name": "other_collection_name",
          "data": [
            {
              "_id": 2,
              "x": 22
            }
          ]
        }
      }
    }
  ]
}