4.7.0 Upgrade: "Error creating index: users -> meteor.users index: bio_1 dup key: { bio: null }"

Description:

After upgrading to a version higher than 4.3.3, an error occurs:

Error creating index: users -> { bio: 1 } { unique: 1 } MongoError: E11000 duplicate key error collection: meteor.users index: bio_1 dup key: { bio: null }
    at MessageStream.messageHandler (/app/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/cmap/connection.js:272:20)
    at MessageStream.emit (events.js:400:28)
    at MessageStream.emit (domain.js:475:12)
    at processIncomingData (/app/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/cmap/message_stream.js:144:12)
    at MessageStream._write (/app/bundle/programs/server/npm/node_modules/meteor/npm-mongo/node_modules/mongodb/lib/cmap/message_stream.js:42:5)
    at writeOrBuffer (internal/streams/writable.js:358:12)
    at MessageStream.Writable.write (internal/streams/writable.js:303:10)
    at Socket.ondata (internal/streams/readable.js:731:22)
    at Socket.emit (events.js:400:28)
    at Socket.emit (domain.js:475:12)
    at addChunk (internal/streams/readable.js:293:12)
    at readableAddChunk (internal/streams/readable.js:267:9)
    at Socket.Readable.push (internal/streams/readable.js:206:10)
    at TCP.onStreamRead (internal/stream_base_commons.js:188:23)
    at TCP.callbackTrampoline (internal/async_hooks.js:130:17) {
  operationTime: Timestamp { _bsontype: 'Timestamp', low_: 41, high_: 1652353563 },
  ok: 0,
  code: 11000,
  codeName: 'DuplicateKey',
  keyPattern: { bio: 1 },
  keyValue: { bio: null },
  '$clusterTime': {
    clusterTime: Timestamp { _bsontype: 'Timestamp', low_: 41, high_: 1652353563 },
    signature: { hash: [Binary], keyId: 0 }
  }
}

Steps to reproduce:

1. Run rocket.chat docker instance lower than 4.3.3 or equals with 4.3.3. I used 3.18.5, 4.0.4, 4.3.3.
2. Update to 4.7.0
3. Run docker logs to track error.

Server Setup Information:

• Version of Rocket.Chat Server: 4.3.3
• Operating System: CentOS Linux release 7.9.2009
• Deployment Method: Docker
• Number of Running Instances: 1
• NodeJS Version: v12.22.8
• MongoDB Version: 4.2.19 / wiredTiger (oplog Enabled)

Additional context

Similar problem marked as resolved in https://github.com/RocketChat/Rocket.Chat/issues/24347
Still occurs for some users.

Reproduce the upgrade from 4.3.3 to 4.7.0 using the Docker setup and inspect creation of the meteor.users bio index. Use the reported MongoDB duplicate-key output and the listed versions to isolate the migration behavior. Done means the upgrade completes without this index-creation error for affected users, with a regression check if the repository provides one.