Use findOneAndUpdate $pull and populate does not update or Populate

This is my data:

{
    "_id" : ObjectId("594e762b03cc52508686ceef"),
    "_members" : [ 
        "59527bd5e521801bf07eab98", 
        "594ecca47a699d1775c2a2db"
    ],
}

I want to delete 59527bd5e521801bf07eab98 from _members.

PostSchema:

const PostsSchema = new Schema({
    // ...
    _members: [{ type: Schema.Types.ObjectId, ref: 'user' }],
    // ...
})

UserSchema:

const UserSchema = new Schema({
    // ...
    posts : [{ type: Schema.Types.ObjectId, ref: 'post' }],
    // ...
})

Find And Update:

let id = mongoose.mongo.ObjectID(req.params.id)
let member = mongoose.mongo.ObjectID(req.params.member)
let populateQuery = [
    {path:'_members', select:'_id'}
]

Post.
findOneAndUpdate(
    {'_id' : id} ,
    {
       $pull: { '_members': { '_id': member }}
     },
     {'new': true}
).
populate(populateQuery).
exec(
  function (err, data) {
    res.send(data)
  }
);