Image style URL does not work
I added following lines in modules/image/image.module, on line 1056 and it started working.

// Create derivated image if it doesn't exist.
  if (!file_exists($file_url) &amp;&amp; !file_exists($uri)) {
    if (file_exists($path)) {
      $current_style = image_style_load($style_name);
      image_style_create_derivative($current_style, $path, $uri);
    }
  }


FYI: This change comes with a risk of when Drupal core updates, this will get removed. Also, I found it affected the performance of search in our platform. So, need a permanent solution.