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As background, consider first the following classes:

public class Product
{
    public ObjectId Id;
    public Review Review;
}

public class Review
{
    public string Author;
    // etc...
}

Given these classes, one can easily create an index on the Author of a Review in a type-safe manner:

var builder = Builders<Product>.IndexKeys;
var keys = builder.Ascending(x => x.Review.Author);

However, suppose that instead of one Review, the Product class defined an enumerable of Reviews?

public class Product
{
    public ObjectId Id;
    public Review[] Reviews;
}

If you attempt to create an index on the Authors of the Reviews you get a compile time error:

var builder = Builders<Product>.IndexKeys;
var keys = builder.Ascending(x => x.Reviews.Author); // compile time error!

We need some way to support creating multikey indexes in a type-safe way.

duplicates

CSHARP-1309 IndexKeysDefinitionBuilder should support defining multikey indexes on members of an array of embedded documents