Elastic Stack 8.9: Faster aggregations and cross-cluster searches

Elastic Stack 8.9 introduces significant performance enhancements, particularly in cross-cluster searches and metric aggregations, leading to faster insights and improved search relevance. Key improvements include a 90% reduction in aggregation latency, significant speed increases in cross-cluster searches by minimizing network trips, and enhanced management of alerting rules using Terraform. The update also addresses issues with Elasticsearch's default refresh behavior and introduces optimizations such as improved cardinality aggregation and geo line simplification, which aid in memory consumption and accuracy. Additionally, the release enhances Kibana features, including new visualization options and improved rule management through Terraform, facilitating better observability and security issue management. Elastic Stack 8.9 is available on Elastic Cloud, providing both hosted and self-managed deployment options, though the release and timing of features are at Elastic's discretion.