Where is this query coming from?

Working with Data
, ,
1

I have some mongodb queries that are returning 1000 results, when I look in the mongodb.com profiler it shows me this:

{
  "command": {
    "getMore": 8223354687588024000,
    "collection": "reservations",
    "batchSize": 1000,
    "lsid": {
      "id": {
        "$binary": {
          "base64": "n8eH91eURw+xpT6fNEPURQ==",
          "subType": "04"
        }
      }
    },
    "$clusterTime": {
      "clusterTime": {
        "$timestamp": {
          "t": 1659066401,
          "i": 542
        }
      },
      "signature": {
        "hash": {
          "$binary": {
            "base64": "PHh4eHh4eD4=",
            "subType": "00"
          }
        },
        "keyId": 7090947493382324000
      }
    },
    "$db": "superhosttools"
  },
  "originatingCommand": {
    "aggregate": "reservations",
    "pipeline": [
      {
        "$changeStream": {
          "fullDocument": "updateLookup"
        }
      }
    ],
    "cursor": {},
    "lsid": {
      "id": {
        "$binary": {
          "base64": "n8eH91eURw+xpT6fNEPURQ==",
          "subType": "04"
        }
      }
    },
    "$clusterTime": {
      "clusterTime": {
        "$timestamp": {
          "t": 1659064839,
          "i": 29
        }
      },
      "signature": {
        "hash": {
          "$binary": {
            "base64": "PHh4eHh4eD4=",
            "subType": "00"
          }
        },
        "keyId": 7090947493382324000
      }
    },
    "$db": "superhosttools"
  },
  "planSummary": [
    {
      "COLLSCAN": {}
    }
  ],
  "cursorid": 8223354687588024000,
  "keysExamined": 0,
  "docsExamined": 26879,
  "numYields": 210,
  "nreturned": 1000,
  "reslen": 15283228,
  "locks": {
    "ReplicationStateTransition": {
      "acquireCount": {
        "w": 2206
      }
    },
    "Global": {
      "acquireCount": {
        "r": 2206
      }
    },
    "Database": {
      "acquireCount": {
        "r": 2206
      }
    },
    "Collection": {
      "acquireCount": {
        "r": 1994
      }
    },
    "Mutex": {
      "acquireCount": {
        "r": 1996
      }
    },
    "oplog": {
      "acquireCount": {
        "r": 211
      }
    }
  },
  "storage": {
    "data": {
      "bytesRead": 2083760,
      "timeReadingMicros": 4772
    }
  },
  "protocol": "op_msg",
  "millis": 249,
  "v": "4.2.21"
}

This looks like the interesting part and we use change streams but I don’t know why we would get 1000 results:

    "pipeline": [
      {
        "$changeStream": {
          "fullDocument": "updateLookup"
        }
      }
    ],