Using a $text search with mongoose population

mongoose-population.js

var express = require('express');
var server = express();
var mongoose = require('mongoose');
var async = require('async');

var db = mongoose.connect('localhost:27017/text');

var ChildSchema = new mongoose.Schema({
	text: String
})

var ParentSchema = new mongoose.Schema({
	name: String,
	children: [{ type: mongoose.Schema.Types.ObjectId, ref: 'Child' }]
})

ChildSchema.index({ '$**': 'text' });

var Child = mongoose.model('Child', ChildSchema);
var Parent = mongoose.model('Parent', ParentSchema);

var child_a = new Child({ text: "Hello world! I\'m alive!!" });
var child_b = new Child({ text: "Hello everyone! I\'m still alive!!" });
var child_c = new Child({ text: "Hello Mum! Do you love me?" });
var child_d = new Child({ text: "Okay. Goodbye cruel world!" });

var parent = new Parent({ name: "Sandra", children: [ child_a._id, child_b._id, child_c._id, child_d._id ] });

async.parallel([
		cb => Child.remove({}).then(cb),
		cb => Parent.remove({}).then(cb)
	], () => {

		async.parallel([
			cb => child_a.save().then(cb),
			cb => child_b.save().then(cb),
			cb => child_c.save().then(cb),
			cb => child_d.save().then(cb),
			cb => parent.save().then(cb).catch((err) => console.log(err))
		], () => {
			
			Parent.find({})
				.populate({
					path: 'children',
					match: { $text: { $search: "hello"}},
				})
				.exec()
				.catch(err => console.log(err))
				.then(doc => console.log(doc));
		});
  
});