import { Client, Databases, IndexType } from "@appwrite.io/console";

const client = new Client()
    .setEndpoint('https://cloud.appwrite.io/v1') // Your API Endpoint
    .setProject('<YOUR_PROJECT_ID>'); // Your project ID

const databases = new Databases(client);

const result = await databases.createIndex(
    '<DATABASE_ID>', // databaseId
    '<COLLECTION_ID>', // collectionId
    '', // key
    IndexType.Key, // type
    [], // attributes
    [] // orders (optional)
);

console.log(result);