Please use updateDocumentByDocId something like this.
String newJsonDoc = "{"DeviceId":"34cd6116b29f2b70592665208631b2c94473dda7","TokenId":"<Your new Token Id>","Email":"asdaasd@yahoo.com","Username":"testing","Password":"dcccc056c6bb70ab32adeaed7922c271","EmailLower":"asdaasdyahoocom","UsernameLower":"testing"}"
storageService.updateDocumentByDocId("<DB Name>", "<Collection Name>", "<Document Id>", newJsonDoc);