Elasticsearch is a highly scalable open-source full-text search and analytics engine. It allows you to store, search, and analyze big volumes of data quickly and in near real time. It is generally used as the underlying engine/technology that powers applications that have complex search features and requirements. Elasticsearch provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents.
One of the most popular frontends for elastic search is Kibana. Using Kibana you can create a visualisations and dashboards. ELK stack (elasticsearch, logstash and kibana) are really popular in the developer community.