change of value is NOT working

[mohanelankuppan]

change of value is NOT working

async function changeValueMongo (db, next) {
res = await db.collection('mongos').find({}).forEach(async function (mongo) {
if (mongo.plan.mongoOperation && mongo.plan.mongoOperation.trip) {
mongo.plan.mongoOperation.trip.forEach(function (mongoData) {
if (mongoData.mongoMethod === 'mongo') {
mongoData.mongoMethod = 'mongodb'
}
})
}
await db.collection('mongos').save(mongo)
});
}

During migrate the value is NOT changing in DB