OpenSearch 2.5 support — VPC egress routing, GPU acceleration

AI Impact Summary

Amazon OpenSearch Service now supports version 2.5, bringing features from 2.4 and 2.5, including VPC egress routing, GPU acceleration for vector indexes, and auto-optimize capabilities. This update introduces new features like semantic highlighting via CloudFormation templates and cross-account ingestion pipelines, alongside support for Graviton4 instances and FIPS 140-2 compliance. These enhancements provide increased flexibility and performance for vector search and data enrichment workloads.