directoryListingOptimization  
  Specifies whether or not performance for your Amazon S3 directories is optimized.
- If using the console, this is enabled by default. 
- If using the API or CLI, this is disabled by default. 
By default, home directory mappings have a TYPE of DIRECTORY. If you enable this option, you would then need to explicitly set the HomeDirectoryMapEntry``Type to FILE if you want a mapping to have a file target.