gRPC for OpenSearch

Based on the available information, there is no explicit mention of gRPC support specifically for Amazon OpenSearch Service version 3.3. While Amazon OpenSearch Service now supports OpenSearch version 3.3 with various enhancements including Apache Calcite as the default query engine for PPL, improvements to the approximation framework, and workload management plugin updates, gRPC support is not mentioned as one of the features included in this version for the managed service.

The sources do mention that Amazon CloudFront now supports gRPC applications, but this is a separate AWS service and not directly related to OpenSearch functionality.

Amazon OpenSearch Service does offer direct access to the Elasticsearch and OpenSearch APIs, which helps existing code and applications work seamlessly with the service, but there's no specific confirmation about gRPC support for the managed OpenSearch service on AWS.

If gRPC support is critical for your use case, I would recommend checking the latest AWS documentation or contacting AWS Support for the most up-to-date information on this specific feature availability.
Sources
Open-Source Search Engine – Amazon OpenSearch Service Resources – Amazon Web Services
Open-Source Search Engine - Amazon OpenSearch Service Managed Service - AWS
Amazon OpenSearch Service now supports OpenSearch version 3.3 - AWS
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