ML APIs

OpenSearch supports the following machine learning (ML) APIs:

• Model APIs
• Model group APIs
• Connector APIs
• Agent APIs
• Memory APIs
• Agentic Memory APIs
• Controller APIs
• Execute Algorithm API
• Execute Tool API
• Tasks APIs
• Profile API
• Stats API
• MCP Server APIs

Memory APIs comparison

OpenSearch provides two different memory systems:

• Memory APIs – Simple conversation history storage for conversational search. Stores question/answer pairs chronologically without processing or learning.

• Agentic Memory APIs – Intelligent memory system for AI agents. Uses large language models (LLMs) to extract knowledge, learn user preferences, and maintain context across sessions. For conceptual information, see Agentic memory.