Introducing the Enterprise Plan for Mission-Critical Applications

Introduced the Enterprise plan, which offers enterprise-grade features and support with self-serve convenience for mission-critical applications. Key additions include multiple availability zones for greater availability when replicas are added to an index, and Prometheus metrics for greater observability. The plan also includes Premium-level support with availability SLAs, response-time SLAs, and 24/7 support access. The 'Free' plan was renamed to 'Starter', and the 'Dedicated' plan was renamed to 'Enterprise Dedicated'. The usage estimator was made more accurate by allowing users to specify metadata size.