title: Handling DocumentClientException with BulkImport
body: <p>I am using Microsoft.Azure.CosmosDB.BulkExecutor.IBulkExecutor.BulkImportAsync to insert documents as a batch. I have implemented unique constraints for my cosmos db collection. If any of the input documents violates the constraint the entire bulk import operation fails with throwing DocumentClientException. Is this an expected behaviour? Or is there a way we can handle the exceptions for failed documents and make sure the valid documents are inserted?</p>