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IFOpenSearch vector store connection becomes unstable after PR #11513, especially when used with FastAPI, causing errors like 'This event loop is already running' and 'Timeout context manager should be used inside a task'.

THENUse asyncio.run() to properly manage the event loop for asynchronous operations with AsyncOpenSearch. Ensure the event loop is not already running before performing async calls. Example: define an async function to open/close the client and run it with asyncio.run().

IFOpenSearch async client causes event loop conflicts in FastAPI services, leading to connection failures.

THENExpose a configuration flag to allow users to instantiate a synchronous OpenSearch client instead of the async version. This avoids async event loop issues in long-running web applications.

IFOpenSearch vector store becomes unstable after PR #11513, especially when used with FastAPI, producing 'This event loop is already running' or 'Timeout context manager should be used inside a task' errors.

THENRevert to using the synchronous opensearch-py client (OpenSearch instead of AsyncOpenSearch) to avoid event loop conflicts. Alternatively, if async is required, wrap each async operation in asyncio.run() and manage the event loop explicitly.