MongoError: multi update only works with $ operators while using bulk find and update in node.js

Why getting error

MongoError: multi update only works with $ operators

while using bulk find and update to update multiple document.

Tried :

var bulk = db.collection('users').initializeUnorderedBulkOp();

var emails = ['a@gmail.com', 'b@gmail.com', 'c@gmail.com'];
var allStatus = ['s1', 's2', 's3'];

for (var i =0; i< allStatus.length; i++) {
  var query = { email: emails[i], status: { '$ne': allStatus[i] } };
  var updateField = {
    $set: {status: allStatus[i], date: new Date()},
    $push: {
      notes: {note: 'jdf'+i, date: new Date()},
      history: {status: allStatus[i], date: new Date()}
    }
  };
  bulk.find(query).update(updateField);
}

bulk.execute();

via Shaishab Roy