Hi Gnaniyar Zubair,
About Search usage in Liferay:
Even if you don't use search funcionality, Liferay itself relies in Elasticsearch index instead of Database in order to do a faster search in some situations.
For example: User and Organizations or Asset Publisher won't work in case index is not working well.
So you should double check that your Liferay works in case you disable Elasticsearch service before considering that you don't need Elasticsearch functionality.
For example, you can enter in gogo shell and stop all Elasticsearch modules and after that, try using your application.
About Embedded Elasticsearch:
My advice is to not use embedded Elasticsearch, it is not supported even by Elastic see: https://www.elastic.co/blog/elasticsearch-the-server#_embedded_elasticsearch_not_supported
If you don't want to have an additional machine with the Elasticsearch node, my advice is to at least, install it inside Liferay server, but outside Liferay in a separate folder, so it will run in a different process and you will avoid lots of problems.