title: S3, cloudfront and expiry date
body: <p>I am using s3 to host static website. This website is placed in s3 bucket and being distributed by cloudfront. It all works well but we are facing problem when we need to change specific files. if we change index.html file in s3 bucket we are not getting the latest file from cloudfront. 
  Should I be setting expiry time on s3 for these static files and only then after expired time will cloudfront look for new version of file and distribute new files?</p>