ai-agents-async-vector-store-opensearchvectorclient-and-opensearchvectorstore-l-6389c5f5

THEN Create AsyncOpensearchVectorClient and AsyncOpensearchVectorStore that inherit from the sync classes. Override query methods (e.g., aquery) with async/await equivalents and monkeypatch `_get_opensearch_client()` to return `AsyncOpenSearch` from opensearch-py. Ensure all database methods respect async patterns for full non-blocking concurrency.

class AsyncOpensearchVectorClient(OpensearchVectorClient):
    async def aquery(self, query: VectorStoreQuery) -> VectorStoreQueryResult:
        # same logic as sync but with async/await
        ...