In 2.0 we are refactoring the exception class hierarchy, as well as adding the Mongo prefix to the few exception class names that didn't already have it.

To prepare the path for migration to 2.0, in 1.10 we will deprecate the 3 exception classes that don't already have a Mongo prefix:

• BulkWriteException
• ExecutionTimeoutException
• WriteConcernException

We will introduce new exceptions with the Mongo prefix, and arrange the class hierarchy so that your existing code will catch either one (for example, if we make the new MongoBulkWriteException a subclass of BulkWriteException, existing code that catches a BulkWriteException will continue to catch a MongoBulkWriteException).