title: How to make Doctrine result cache work with Redis on Symfony 3.4
body: <p>Currently I have this on
  <strong>framework.cache:</strong></p>
  <pre><code>app: cache.adapter.redis
  default_redis_provider: redis://localhost
  </code></pre>
  <p><strong>doctrine.orm:</strong></p>
  <pre><code>metadata_cache_driver: redis
  result_cache_driver: redis
  query_cache_driver: redis
  </code></pre>
  <p>Sure, it doesn't work, but I have no idea what to even try now. Doing type: pool, pool: cache.app works perfect on Symfony 5/6, but it doesn't do anything on Symfony 3.4, anyone have any ideas?</p>