title: Update extension for multiple files at once on Amazon S3
body: <p>I'm having about 1 million files on my S3 bucket and unfortunately these files were uploaded with wrong extension. I need to add a '.gz' extension to every file in that bucket.</p>
  
  <p>I can manage do that by using aws cli:
  <code>
  aws s3 mv bucket_name/name_1 bucket_name/name_1.gz
  </code></p>
  
  <p>This works fine but the script is running so slow since it moves the file one by one, in my calculation it'll take up to 1 week, which is not acceptable.</p>
  
  <p>I wonder if we have any better and faster way to achieve this goal ?</p>