Mongoose delete nested object on time expiration - mongodb

Question

I'm trying to find out the way to remove nested object in one collection once the document from another collection is expired
LocationsSchema.js
const mongoose = require('mongoose');
const locationsSchema = mongoose.Schema({
name: {
type: String,
required: [true, 'Please add a location name (string)']
},
confirmedBookings: [
{
startDate: {
type: Number
},
finishDate: {
type: Number
}
}]
}, {
timestamps: true
})
module.exports = mongoose.model('Locations', locationsSchema)
BookingsSchema.js
const mongoose = require('mongoose');
const Location = require('./locationModel');
const bookingSchema = mongoose.Schema({
startDate: {
type: Number,
required: [true, 'Please add a valid Date']
},
finishDate: {
type: Number,
> timestamp
required: [true, 'Please add a valid Date'],
index: true
},
location: {
type: mongoose.Schema.Types.ObjectId,
ref: Location
}
}, {
timestamps: true
})
bookingSchema.index({finishDate: 1}, {expireAfterSeconds: 0})
module.exports = mongoose.model('Booking', bookingSchema)
This is how I delete the object manually in
BookingsController.js
const deleteBookings = asyncHandler(async (req, res) => {
const booking = await Booking.findById(req.params.id);
if (!booking) {
res.status(400);
throw new Error('Booking not found');
}
await Location.findOneAndUpdate({_id: booking.location},
{$pull: {'confirmedBookings': {_id: req.params.id}}});
await booking.remove();
res.status(200).json({id: req.params.id});
})
But I also want to be able to delete the objects ones theirs finishDate are before the present time.
I tried to create an TTL index for that but it seems it doesn't work in the way I did it