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IFUnclosed client session error after deleting OpensearchVectorStore instances using OpensearchVectorClient.

THENImplement cleanup using try...finally pattern to ensure the OpenSearch client is closed and the index is deleted. Alternatively, explicitly call close() on the async client after use.

IFUsing litellm.acompletion with concurrent requests (e.g., asyncio.gather and asyncio.Semaphore) leads to unclosed aiohttp client sessions and connectors, generating ResourceWarnings after all requests complete.

THENEnsure the underlying aiohttp client session is properly closed after each batch of concurrent requests. This can be done by explicitly creating and closing a ClientSession, or by upgrading to a version of litellm that handles session lifecycle correctly. If using a custom session, pass it to acompletion via the client_session parameter and close it after all tasks finish.

IFOpensearchVectorClient does not close the async client on destruction, causing unclosed aiohttp sessions and warnings.

THENImplement cleanup using try...finally pattern in the fixture or explicitly call client._os_async_client.close() when ending sessions. Ensure the async client is closed after each operation to prevent resource leaks.