index.js

const algolia = require("algoliasearch")
const client = algolia(ALGOLIA_APPLICATIONID, ALGOLIA_APIKEY)

async function run() {
  const source = client.initIndex("test-index-from")
  const target = client.initIndex("test-index-to")
  const task = await client.copyIndex(source.indexName, target.indexName)
  await source.waitTask(task.taskID)
}

run().then(() => {
  console.log("Finished")
  process.exit(0)
}).catch(error => {
  console.error(error)
  process.exit(1)
})

package.json

{
  "name": "tmp",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "algoliasearch": "^3.33.0"
  }
}