features

OpenSearch Rust SDK Feature Implementation Plan

This directory contains detailed feature specifications and implementation plans for bringing the OpenSearch SDK to Rust. The features are based on analysis of both the Java SDK and Python SDK.

Feature Categories

Core Features (Priority: High)

1. Core Extension Framework - Foundation for all extensions
2. Transport Protocol - Binary communication with OpenSearch
3. REST API Framework - HTTP endpoint support
4. Settings Management - Type-safe configuration

Extension System (Priority: Medium)

5. Action System - Request/response handling
6. Search Extensions - Queries, aggregations, scoring
7. Analysis Extensions - Tokenizers, analyzers, filters
8. Script Extensions - Custom scripting support

Advanced Features (Priority: Medium-Low)

9. Ingest Extensions - Data processing pipelines
10. Mapper Extensions - Custom field types
11. Discovery & Clustering - Node and service discovery
12. Security Integration - Authentication and authorization

Infrastructure (Priority: Low)

13. Client Libraries - Rust client for OpenSearch
14. Testing Framework - Extension testing utilities
15. Migration Tools - Plugin to extension migration

Implementation Strategy

Phase 1: Foundation (Current Status: In Progress)

• Basic transport protocol (Hello World)
• Complete extension framework
• Full transport protocol implementation
• Basic REST handler support

Phase 2: Core Functionality

• Settings management system
• Action system with async support
• REST API registration and routing
• Basic client support

Phase 3: Extension Points

• Search extension support
• Analysis extension support
• Script extension support
• Ingest processor support

Phase 4: Advanced Features

• Mapper extensions
• Extension-to-extension communication
• Security integration
• Performance optimizations

Design Principles

1. Memory Safety: Leverage Rust's ownership system for safe concurrency
2. Type Safety: Strong typing with compile-time guarantees
3. Performance: Zero-cost abstractions and efficient async runtime
4. Ergonomics: Intuitive APIs following Rust idioms
5. Compatibility: Maintain protocol compatibility with Java/Python SDKs

Feature Comparison

Feature	Java SDK	Python SDK	Rust SDK (Planned)
Extension Framework	Full	Basic	Basic (In Progress)
Transport Protocol	Full	Full	Partial (In Progress)
REST API	Full	Full	Planned
Settings	Full	Full	Planned
Search Extensions	Full	None	Planned
Analysis Extensions	Full	None	Planned
Script Extensions	Full	None	Planned
Client Support	Multiple	None	Planned

Getting Started

Each feature document includes:

• Feature overview and motivation
• API design and interfaces
• Implementation plan with milestones
• Code examples
• Testing strategy
• Performance considerations

Start with the Core Extension Framework to understand the foundation of the SDK.