This article reviews Amazon OpenSearch Service features released in H1 2023, covering search capabilities, observability, ingestion, security, operations, and dashboards improvements.

• OpenSearch Serverless with vector engine for AI and semantic search capabilities
• Point in Time search ensures consistent pagination despite index changes
• Search relevance plugin enables side-by-side result comparison in dashboards
• New field types: Cartesian for geospatial data, flat object for JSON searching
• GeoHex grid aggregation for high-precision geographical analysis
• Simple Schema for Observability (SS4O) unified telemetry data structure
• Jaeger traces support integrated with Observability plugin
• Amazon OpenSearch Ingestion fully managed pipeline with auto-scaling
• SAML authentication configurable during domain creation
• Security analytics plugin with 2,200+ Sigma rules for threat detection
• Amazon Security Lake integration for real-time security event ingestion
• Enhanced dry run validates configuration changes before deployment
• Multi-AZ with Standby provides 99.99% availability
• Skip unavailable clusters option for cross-cluster search resilience
• Snapshot management and index/data streams management UI improvements

OpenSearch Service H1 2023 delivered significant enhancements across search, observability, security, and operations, enabling serverless deployments and improved cluster management.