Introducing memory retention for agentic memory in OpenSearch

OpenSearch 3.8 introduces an experimental memory retention feature for agentic memory containers, allowing users to set age-based or count-based limits to automatically delete stale sessions, long-term memory, and history. This functionality helps reduce storage costs and maintains agent performance by preventing context degradation from outdated data. Additionally, the feature supports pinning important memories to prevent deletion and allows for configuring cluster-wide defaults for easier management across multiple containers.