The MongoDB Connector for Apache Kafka version 1.7 has introduced several key features, including improved error handling with a dead letter queue, bulk write improvements to reduce reprocessing of failed documents, and changes to the retry logic. The connector now automatically sends messages that it cannot process to the dead letter queue, providing more flexibility in managing errant records. Additionally, the connector's bulk write behavior has been updated to allow for more control over how errors are handled during large batch operations. These updates aim to improve the overall reliability and efficiency of the connector.