swiper multiple instances - vanilla JS

import Swiper from "swiper/bundle";
import "swiper/swiper-bundle.css";

window.addEventListener(
  "load",
  () => {
    // swiper
    var slider = document.querySelectorAll(".swiper-container");
    for (let index = 0; index < slider.length; index++) {
      slider[index].classList.add("swiper-container-" + index);

      var mySwiper = new Swiper(".swiper-container-" + index, {
        slidesPerView: 2,
        centeredSlides: true,
        spaceBetween: 5,
        initialSlide: 2,
      });
    }
  },
  false
);