I think when most people say NoSQL they don't mean S3 (even though it is like a database). In general I think - S3 - Redis/Memcached - Elasticsearch aren't

I think when most people say NoSQL they don't mean S3 (even though it is like a database). In general I think - S3 - Redis/Memcached - Elasticsearch aren't really NoSQL databases in the Marketing sense since they fulfil such a specific purpose.