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From Wikitech

ES may refer to:

  • External storage, the abstraction layer in MediaWiki for storing wiki page content outside the main wiki database. Related host names at WMF are prefixed with es, like es1001.
  • Elasticsearch, an open-source search engine used by Wikimedia. Typical releases use a minor version like v6.3 or v7.0, but release lines can be referred to as ES6 or ES7.
  • Elastic Stack, a term for the combination of Elasticsearch, Logstash, and Kibana. Also known as an ELK Stack.
  • ECMAScript, popularly known as JavaScript, of which editions are often referred to by number or year, such as ES5, ES6, or ES2017.