$ mongo --port 51000
MongoDB shell version v4.2.3-rc1
connecting to: mongodb://127.0.0.1:51000/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("399d5b08-5423-45a7-aac8-17dfb97586a5") }
MongoDB server version: 4.2.3-rc1
Server has startup warnings: 
2020-09-18T14:02:23.050-0400 I  CONTROL  [main] 
2020-09-18T14:02:23.050-0400 I  CONTROL  [main] ** WARNING: Access control is not enabled for the database.
2020-09-18T14:02:23.050-0400 I  CONTROL  [main] **          Read and write access to data and configuration is unrestricted.
2020-09-18T14:02:23.050-0400 I  CONTROL  [main] 
mongos> use test
switched to db test
mongos> db.createCollection('activity')
{
	"ok" : 1,
	"operationTime" : Timestamp(1600452398, 2),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1600452398, 2),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
mongos>
mongos> sh.shardCollection('test.activity', {domain: 1, sender: 1 ,objecttype:1 })
{
	"collectionsharded" : "test.activity",
	"collectionUUID" : UUID("1a615b36-6461-445a-a791-2aa65bf7c1d4"),
	"ok" : 1,
	"operationTime" : Timestamp(1600452428, 8),
	"$clusterTime" : {
		"clusterTime" : Timestamp(1600452428, 8),
		"signature" : {
			"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
			"keyId" : NumberLong(0)
		}
	}
}
mongos>

'use strict';
  
const { MongoClient } = require('mongodb');

run().catch(err => console.log(err));

async function run() { 
  const client = await MongoClient.connect('mongodb://localhost:51000/test?retryWrites=true', {
    useNewUrlParser: true,
    useUnifiedTopology: true
  });
  const db = client.db();

  await db.collection('activity').deleteMany({});

  await db.collection('activity').insertOne({ domain: 'a', sender: 'b', objecttype: 'chair', hash: 'random1' });

  console.log(client.topology.description);

  await db.collection('activity').updateOne(
  { domain: 'a', sender: 'b', objecttype: 'chair', hash: 'random1'},  
  { '$set': { domain: 'example.com', sender: 'joe@example.com', objecttype: 'chair', foo: 'bar'}
  } ); 

  console.log('Done');
}

TopologyDescription {
  type: 'Single',
  setName: null,
  maxSetVersion: null,
  maxElectionId: null,
  servers: Map {
    'localhost:51000' => ServerDescription {
      address: 'localhost:51000',
      error: undefined,
      roundTripTime: 9,
      lastUpdateTime: 261861846,
      lastWriteDate: null,
      opTime: null,
      type: 'Mongos',
      topologyVersion: undefined,
      minWireVersion: 0,
      maxWireVersion: 8,
      maxBsonObjectSize: 16777216,
      maxMessageSizeBytes: 48000000,
      maxWriteBatchSize: 100000,
      hosts: [],
      passives: [],
      arbiters: [],
      tags: [],
      logicalSessionTimeoutMinutes: 30,
      '$clusterTime': [Object]
    }
  },
  stale: false,
  compatible: true,
  compatibilityError: null,
  logicalSessionTimeoutMinutes: 30,
  heartbeatFrequencyMS: 10000,
  localThresholdMS: 15,
  commonWireVersion: 8
}