var AWS = require("aws-sdk");
var endpoint = new AWS.Endpoint(domain);
var request = new AWS.HttpRequest(endpoint, region);

request.method = method;
request.path += index;
request.body = "";
request.headers["host"] = domain;
request.headers["Content-Type"] = "application/json";
request.headers["Content-Length"] = Buffer.byteLength(request.body);

var credentials = new AWS.EnvironmentCredentials("AWS");
var signer = new AWS.Signers.V4(request, "es");
signer.addAuthorization(credentials, new Date());

var client = new AWS.HttpClient();
client.handleRequest(
  request,
  null,
  function (response) {
    console.log(response.statusCode + " " + response.statusMessage);
    var responseBody = "";
    response.on("data", function (chunk) {
      responseBody += chunk;
    });
    response.on("end", function (chunk) {
      success(responseBody);
    });
  },
  function (error) {
    console.log("Error: " + error);
  }
);

var AWS = require("aws-sdk");

const { fromEnv } = require("@aws-sdk/credential-providers");

var endpoint = new AWS.Endpoint(domain);
var request = new AWS.HttpRequest(endpoint, region);

request.method = method;
request.path += index;
request.body = "";
request.headers["host"] = domain;
request.headers["Content-Type"] = "application/json";
request.headers["Content-Length"] = Buffer.byteLength(request.body);

var credentials = // JS SDK v3 switched credential providers from classes to functions.
// This is the closest approximation from codemod of what your application needs.
// Reference: https://www.npmjs.com/package/@aws-sdk/credential-providers
fromEnv("AWS");
var signer = new AWS.Signers.V4(request, "es");
signer.addAuthorization(credentials, new Date());

var client = new AWS.HttpClient();
client.handleRequest(
  request,
  null,
  function (response) {
    console.log(response.statusCode + " " + response.statusMessage);
    var responseBody = "";
    response.on("data", function (chunk) {
      responseBody += chunk;
    });
    response.on("end", function (chunk) {
      success(responseBody);
    });
  },
  function (error) {
    console.log("Error: " + error);
  }
);