Dressing provides the functionality of CloudFunctions to connect Firebase and ElasticSearch. You need to use Salada for clients.
$ npm install dressing
To set the needed firebase config variables we use the Firebase CLI functions:config:set command:
$ firebase functions:config:set elasticsearch.username="user" elasticsearch.password="your_password" elasticsearch.url="http://0.0.0.0/elasticsearch/"
const functions = require('firebase-functions');
const Dressing = require('dressing');
const dressing = new Dressing(functions);
/**
Elasticsearch
*/
// PUT a user class to ElasticSearch
exports.indexUserToElastic = dressing.put('user')