Make plain https requests to an OpenSearch domain using AWS Sigv4 signing

EsClientBuilder.ts

import { Sha256 } from '@aws-crypto/sha256-browser';
import { defaultProvider } from '@aws-sdk/credential-provider-node';
import { NodeHttpHandler } from '@aws-sdk/node-http-handler';
import { HttpRequest } from '@aws-sdk/protocol-http';
import { SignatureV4 } from '@aws-sdk/signature-v4';
// import { region } from './http-agent'; use an aws region string
// import { getEnv } from './utils'; just calls process.env or returns default

export async function indexDocumentonAwsES(body, index, type, id, domain) {
  const request = new HttpRequest({
    body: JSON.stringify(body),
    headers: {
      'Content-Type': 'application/json',
      host: domain
    },
    hostname: domain,
    method: 'PUT',
    path: `${index}/${type}/${id}`
  });
  const signer = new SignatureV4({
    credentials: defaultProvider(),
    region,
    service: 'es',
    sha256: Sha256
  });
  const signedRequest = await signer.sign(request);
  const client = new NodeHttpHandler();
  // @ts-ignore
  const { response } = await client.handle(signedRequest);
  console.log(`${response.statusCode} ${response.body.statusMessage}`);
  let responseBody = '';
  await new Promise(() => {
    response.body.on('data', chunk => {
      responseBody += chunk;
    });
    response.body.on('end', () => {
      console.log('Response body: ' + responseBody);
    });
  }).catch(error => {
    console.log(`Error: ${error}`);
  });
}