Add elasticsearch to non-free.md (#3021)

2 years ago · d57a905e29
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 - [hMailServer](https://www.hmailserver.com) `⊘ Proprietary` - Open source e-mail server for Microsoft Windows. ([Source Code](https://github.com/hmailserver/hmailserver)) `C++`
 - [Poste.io](https://poste.io) `⊘ Proprietary` - Full featured solution for your Email server. Native implementation of last anti-SPAM methods, webmail and easy administration included. Free tier available. ([Demo](https://poste.io/demo))

+## Search Engines
+- [ElasticSearch](https://www.elastic.co/elasticsearch/) - `⊘ Proprietary` - A distributed, RESTful search and analytics engine. ([Source Code](https://github.com/elastic/elasticsearch)) `SSPL-1.0` `Java` 
  
 ## Software Development