Set Audit Log Trimming using CSOM

Hi All,

I am facing issue when I am trying to set the location for audit log trimming using below code:

                var allProperties = context.Web.AllProperties;   
                allProperties["_auditlogreportstoragelocation"] = newLib.RootFolder.ServerRelativeUrl;
                context.Web.Update();
                context.ExecuteQuery();

Strange this is when I  try to add value to propertybag "_auditlogreportstoragelocation" using designer, its reflecting under Site Action > Site Settings > Site Collection Audit Setting. help on this issue is highly appreciated. 

Thanks

Ankit