This value is a suffix that is appended to a request that is for a "directory" on the website endpoint (e.g. if the suffix is index.html and you make a request to samplebucket/images/ the data that is returned will be for the object with the key name images/index.html)
The suffix must not be empty and must not include a slash character.

C# |
public string IndexDocumentSuffix { get; set; }