Firebase Cloud Functions x ElasticSearch

index.js

const functions = require('firebase-functions')
const { Client } = require('@elastic/elasticsearch')
const config = {
  cloud: {
    id: 'xxx'
  },
  auth: {
    username: 'xxx',
    password: 'xxx'
  }
}
const client = new Client(config)

exports.mySearchFunc = functions.region('asia-northeast1').https.onCall(async (data, context) => {
  const result = await client.search({
    index: 'xxx',
    body: {
      query: {
        match_all: {}
      }
    }
  }).catch(console.log)
  return result.body.hits.hits
})