Producing a sorted wordcount with Spark

I'm currently learning how to use Apache Spark. In order to do so, I implemented a simple wordcount (not really original, I know). There already exists an example on the documentation providing the needed code. However, I tried to go one step further and to produce the result as a sorted list (by frequence) by using the spark modules. A use case would be sortedWordcount("I fish a fish") -> [(fish,