OpenAI

import { OpenAIEmbedding } from "@llamaindex/openai"; import { Document, Settings, VectorStoreIndex } from "llamaindex";  Settings.embedModel = new OpenAIEmbedding();  const document = new Document({ text: essay, id_: "essay" });  const index = await VectorStoreIndex.fromDocuments([document]);  const queryEngine = index.asQueryEngine();  const query = "What is the meaning of life?";  const results = await queryEngine.query({  query, });