How can a transaction be aborted in MongoDB's shell (mongosh)?

In MongoDB, transactions can be managed through sessions, and the method to abort a transaction within the MongoDB shell is specifically represented by the session.abortTransaction() method. This function is designed to terminate an ongoing transaction, rolling back any changes that were made during that transaction.

When a transaction is aborted using this method, all operations that were part of the transaction are undone, ensuring that the database remains in a consistent state. This is particularly useful for scenarios where an error occurs or certain conditions aren't met, making it necessary to discard the changes.

The other options provided do not reflect valid methods for aborting a transaction in MongoDB. For instance, session.endTransaction() is not a method within the MongoDB API, which can be confusing as it seems related to the transaction management context. Similarly, session.cancelTransaction() and session.stopTransaction() do not exist in MongoDB's set of functions for session management either. Thus, understanding the correct method is crucial for effective database management and ensuring the integrity of data during transactions.