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Advanced MongoDB in .NET: Aggregation, Bulk Writes, Transactions, Change Streams and Testcontainers

In .NET, WithTransactionAsync reruns the body of a transaction on transient errors (a write conflict, for example), so the body must be short and free of side effects. With real output: the body running dozens of times for 20 concurrent orders, fluent Aggregate and BsonDocument stages, ordered and unordered BulkWriteAsync, the client-level bulk write of 8.0, a change stream in a BackgroundService that stores its resume token, and an integration test with a replica set using Testcontainers.