当只使用一个节点(服务器)时，弹性搜索是否仍然有用?

I'm curious but Couldn't find any resource regarding a one server (node) elasticsearch system. I have read about scaling-out benefits of NOSQL and it data-sharding. if running my NOSQL db on a one server and having elasticSearch on same server, would elastic still be faster than the alternatives (relational db with normal queries/ lucene search) or would it will be 'loosing' it advantage as a distributed/clustered search engine?I'm curious but Couldn't find any resource rega