ES

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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.