Concateneate first update with second aggregate lookup request

Working with Data
,
#1

Have an api like:

var filter = Builders<Deal>.Filter.Eq("_id", offerPlusModel.DealId);

                var update = Builders<Deal>.Update
                    .AddToSet(x => x.Offers, offerToCreate)
                    .Set("LastModified", DateTime.Now.ToString("dddd, dd MMMM yyyy HH:mm:ss"));

                await _unitOfWork.GetCollection<Deal>("Deal").UpdateOneAsync(filter, update);

                var results =  _unitOfWork.GetCollection<Deal>("Deal")
                    .Aggregate()
                    .Lookup(
                        "UserProfile",
                        "offers.clientId",
                        "_id",
                        @as: "dealWithOffersWithClients")
                    .ToListAsync().Result;

This first creates object by update, then from this object searches by clientId additional information for client.
Works fine, but firstly, I want only one request, secondly, I need just some fields from the client model in UserProfile table.

Ok, how to concatenate in one request?

#2

Structure of table Deal:

_id:"f9097a32-23a7-4242-b34d-1a6d54c17e14"

offers:Array
0:Object 
     _id:"5623524d-10a5-45ed-8a82-b5e9ae62d893"
     parcelId:"330c2c46-d2d9-4ba4-8471-8510bc8c100e"
     clientId:"3f7d416f-879d-41be-b411-2a08db977aa6"
totalSum:"0"
description:null
dealStatus:3
lastModified:"Friday, 04 February 2022 21:40:05"
shifterId:"3f7d416f-879d-41be-b411-2a08db977aa6"
#3

Also I would like to obtain not all aggreagated documents, but only for the deal, that I updated.

#4

Ok, I have now that I want, but again in two queries.

                var filter = Builders<Deal>.Filter.Eq("_id", offerPlusModel.DealId);

                var update = Builders<Deal>.Update
                    .AddToSet(x => x.Offers, offerToCreate)
                    .Set("LastModified", DateTime.Now.ToString("dddd, dd MMMM yyyy HH:mm:ss"));

                await _unitOfWork.GetCollection<Deal>("Deal").UpdateOneAsync(filter, update);

                var results =  _unitOfWork.GetCollection<Deal>("Deal")
                    .Aggregate()
                    .Lookup(
                        "UserProfile",
                        "offers.clientId",
                        "_id",
                        @as: "dealWithOffersWithClients")
                    .Project(Builders<BsonDocument>.Projection
                        .Exclude("dealWithOffersWithClients._id")
                        .Exclude("dealWithOffersWithClients.createdOn")
                        .Exclude("dealWithOffersWithClients.thirdName")
                        .Exclude("dealWithOffersWithClients.birthday")
                        .Exclude("dealWithOffersWithClients.phoneNumber")
                        .Exclude("dealWithOffersWithClients.phoneNumberConfirmed")
                        .Exclude("dealWithOffersWithClients.email")
                        .Exclude("dealWithOffersWithClients.emailConfirmed")
                        .Exclude("dealWithOffersWithClients.active")
                        .Exclude("dealWithOffersWithClients.isNew")
                        .Exclude("dealWithOffersWithClients.password")
                        .Exclude("dealWithOffersWithClients.smsCode")
                        .Exclude("dealWithOffersWithClients.fcmToken")
                        .Exclude("dealWithOffersWithClients.smsCode")
                        .Exclude("dealWithOffersWithClients.claims")
                    )
                    .Match(new BsonDocument { { "_id", offerPlusModel.DealId.ToString() } })
                    .ToListAsync().Result;