Listener/TaggedEntityListener.php
public function postFlush()
    {
        $this->eventDispatcher->dispatch(
            HttpCacheEvents::INVALIDATE_TAG,
            new HttpCacheEvent($this->tagsToInvalidate)
        );
        $this->reset();
    }
public function postFlush()
    {
        $this->eventDispatcher->dispatch(
            HttpCacheEvents::INVALIDATE_TAG,
            new HttpCacheEvent($this->tagsToInvalidate)
        );
        $this->reset();
    }
Post flush event handler.