docs: private org.ehcache.CacheManager getEhcacheManager() {
          try {
              final Field f = eh107CacheManager.getClass().getDeclaredField("ehCacheManager");
              f.setAccessible(true);
  
              return (org.ehcache.CacheManager) f.get(eh107CacheManager);
          } catch (final IllegalAccessException e) {
              throw new RuntimeException(e);
          } catch (final NoSuchFieldException e) {
              throw new RuntimeException(e);
          }
      }