I am using Magento Version 2.2.3.
And my current version of Elastic Search is 6.2.4.
But my search result are not coming correct.Can I Update my ElasticSearch version to 7.1 or more in this magento 2.2.3 version.
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Sign up to join this communityUp to v6 at the moment (April 2020) but that may change in future
https://devdocs.magento.com/guides/v2.3/config-guide/elasticsearch/es-overview.html
Can you provide more detail on what's wrong with results
You could of course look at third party extensions