type esClient interface {
	isAtleastV7() bool
	createIndex(ElasticsearchArgs) error
	ping(context.Context, ElasticsearchArgs) (bool, error)
	stop()
	entryExists(context.Context, string, string) (bool, error)
	removeEntry(context.Context, string, string) error
	updateEntry(context.Context, string, string, event.Event) error
	addEntry(context.Context, string, event.Event) error
}

// ElasticsearchArgs - Elasticsearch target arguments.

      ReferenceEntry<K, V> e;
      while ((e = writeQueue.peek()) != null && map.isExpired(e, now)) {
        if (!removeEntry(e, e.getHash(), RemovalCause.EXPIRED)) {
          throw new AssertionError();
        }
      }
      while ((e = accessQueue.peek()) != null && map.isExpired(e, now)) {
        if (!removeEntry(e, e.getHash(), RemovalCause.EXPIRED)) {
          throw new AssertionError();
        }
      }
    }

    // remove absent
    assertFalse(segment.removeEntry(entry, hash, RemovalCause.COLLECTED));

    // remove live
    segment.recordWrite(entry, 1, map.ticker.read());
    table.set(0, entry);
    segment.count = 1;
    assertTrue(segment.removeEntry(entry, hash, RemovalCause.COLLECTED));
    assertNotificationEnqueued(map, key, value);

    // remove absent
    assertFalse(segment.removeEntry(entry, hash, RemovalCause.COLLECTED));

    // remove live
    segment.recordWrite(entry, 1, map.ticker.read());
    table.set(0, entry);
    segment.count = 1;
    assertTrue(segment.removeEntry(entry, hash, RemovalCause.COLLECTED));
    assertNotificationEnqueued(map, key, value);