Indexes are not created when we set readPreference to primary

[gemyero]

Do you want to request a feature or report a bug?
I want to report a bug.

What is the current behavior?
Suppose I have a replicaset with two nodes 1 primary and 1 secondary.

Primary: localhost:27017
Secondary: localhost:27018

When I connect using mongoose to the primary node using the following connection uri
mongodb://user:password@localhost:27017/dbName?authSource=admin&readPreference=primary

When I setup indexes on schema, it will not be created!

If the current behavior is a bug, please provide the steps to reproduce.

const mongoose = require('mongoose');

mongoose.set('debug', true);

const mongoUrl =
  'mongodb://user:password@localhost:27017/dbName?authSource=admin&readPreference=primary';

const userSchema = new mongoose.Schema({
  name: { type: String, required: true },
});

userSchema.index({ email: 1 }, { unique: true });

const User = mongoose.model('User', userSchema);

(async () => {
  await mongoose.connect(mongoUrl);
  console.log('Connected...');
})();

What is the expected behavior?

Indexes should be created successfully as I provide readPreference as primary which is the default one. If I omit readPreference from options indexes will be created successfully, I know that readPreference=primary is the default but we should handle this also.

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.
MongoDB: 4.4.9
Node.js: v14.17.5
Mongoose: 6.0.8

[gemyero]

#10861