The general features of Elasticsearch are as follows −
Elasticsearch is scalable up to petabytes of structured and unstructured data.
Elasticsearch can be used as a replacement of document stores like MongoDB and RavenDB.
Elasticsearch uses denormalization to improve the search performance.
Elasticsearch is one of the popular enterprise search engines, and is currently being used by many big organizations like Wikipedia, The Guardian, StackOverflow, GitHub etc.
Elasticsearch is an open source and available under the Apache license version 2.0.
