change_index_settings.js

// Install the API client: https://www.algolia.com/doc/api-client/getting-started/install/javascript/?client=javascript
const algoliasearch = require("algoliasearch");
const dotenv = require("dotenv");

dotenv.config();

// Get your Algolia Application ID and (admin) API key from the dashboard: https://www.algolia.com/account/api-keys
// and choose a name for your index. Add these environment variables to a `.env` file:
const ALGOLIA_APP_ID = process.env.ALGOLIA_APP_ID;
const ALGOLIA_API_KEY = process.env.ALGOLIA_API_KEY;
const ALGOLIA_INDEX_NAME = process.env.ALGOLIA_INDEX_NAME;

// Start the API client
// https://www.algolia.com/doc/api-client/getting-started/instantiate-client-index/
const client = algoliasearch(ALGOLIA_APP_ID, ALGOLIA_API_KEY);

// Create an index (or connect to it, if an index with the name `ALGOLIA_INDEX_NAME` already exists)
// https://www.algolia.com/doc/api-client/getting-started/instantiate-client-index/#initialize-an-index
const index = client.initIndex(ALGOLIA_INDEX_NAME);

// Changes an index's settings, Only specified settings are overridden; unspecified settings are left unchanged
//    https://www.algolia.com/doc/api-reference/api-methods/set-settings/#about-this-method
index
  .setSettings({
      searchableAttributes: ["name", "city"],
      customRanking: ["desc(followers)"],
    }, {
  // Option to forward the same settings to the replica indices.
      forwardToReplicas: true
    })
  // Wait for the indexing task to complete
  // https://www.algolia.com/doc/api-reference/api-methods/wait-task/
  .wait()
  .then((response) => {
  // Display response (updatedAt, taskID)
    console.log(response);
  // Display both changed settings
    index.getSettings().then((settings) => {
      console.log(settings["searchableAttributes"], settings["customRanking"]);
    });
  })
  .catch((error) => console.log(error));