The Aerospike Vector Search (AVS) Python client has undergone significant updates in version 4.0.0, including breaking changes, new features, and the removal of deprecated functionality. The introduction of the `Index` object simplifies API operations on specific indexes by enabling targeted searches, retrievals, and monitoring of index status. Users are encouraged to migrate to the new patterns to take full advantage of the updated library and avoid disruptions. Breaking changes include the merging of admin and standard clients into a single unified client object, the removal of deprecated methods like `wait_for_index_completion`, and changes to default parameters such as limiting search results to 10 by default. The latest features and best performance are available in version 4.0.0, with a migration guide provided to help users handle breaking changes.