As Shawn had pointed, if you are using CloudSolrServer client, then you are immune to the scenario where a shard and its replica(s) go down. The communication should be ideally with the zookeepers and not the solr servers directly, One thing you need to make sure is to add the shard.tolerant parameter so that the query returns result from the shard which is alive, though it'll fetch a partial resultset.
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