title: Caffeine Cache, get oldest element
body: <p>Since the concurrentedLinkedHashmap authors do advice to switch to caffeine if using java 8.
  I wanted to know how I can get the oldest element of the cache.
  (In the LinkedHashMap I'm able to remove the first element of the iterator to achieve this).</p>
  
  <p>I, unfortunately, didn't find anything in the caffeine documentation.</p>