Exclude property and Replace/Update document

Hi everyone,
I have a CreateDate property that I want to insert but I don´t want to update/replace it. The method that I am using is ReplaceOneAsync.
I couldn’t find information about this on internet. This is a example class and what I am trying to do

public class Document {
    public string Name { get; set; }
    public string Description{ get; set; }
    public DateTime CreateDate { get; set; }

await Collection.ReplaceOneAsync(filter, documentToUpdate);

Thanks in advance.
Kind Regards