Is config('database.redis.options.cluster') used only for predis?

[JonathanGawrych]

Long ago someone created our database config without the 'database.redis.options.cluster' option. During our upgrade to Laravel 11, I read about this, the docs saying:

By default, Laravel will use native Redis clustering since the options.cluster configuration value is set to redis. Redis clustering is a great default option, as it gracefully handles failover.
-https://laravel.com/docs/11.x/redis#clusters

Intrigued, I searched the source code for use of cluster, but could not find it. The closest I found was in RedisManager::resolve():

framework/src/Illuminate/Redis/RedisManager.php

Lines 103 to 121 in abf86b0

	public function resolve($name = null)
	{
	$name = $name ?: 'default';
	$options = $this->config['options'] ?? [];
	if (isset($this->config[$name])) {
	return $this->connector()->connect(
	$this->parseConnectionConfiguration($this->config[$name]),
	array_merge(Arr::except($options, 'parameters'), ['parameters' => Arr::get($options, 'parameters.'.$name, Arr::get($options, 'parameters', []))])
	);
	}
	if (isset($this->config['clusters'][$name])) {
	return $this->resolveCluster($name);
	}
	throw new InvalidArgumentException("Redis connection [{$name}] not configured.");
	}

But this didn't seem to care about the cluster config inside options. Just if there was a defined config inside clusters.

Is this value just forwarded to the Connector? I found references to cluster in predis (https://github.com/predis/predis?tab=readme-ov-file#client-configuration) but not in phpredis. We are currently using phpredis, so is this config unused for us? Thanks!