Elasticsearch is a full-text searchable engine which is based on Lucerne. Generally, Elasticsearch was released as an open source platform which was developed in JavaScript under the Apache license terms. Using the phrase "multi-tenant and capable full-text search," Elasticsearch can be justified shortly. It has an HTTP interface for web and schema-free JSON files. As it is developed in Javascript, it can index the documents in variedly diverse formats.

Elasticsearch promotes the indexing of documents targeting the repository. Elasticsearch stores and executes the data as it converts the initial form of files into the internal documents and secures them with the basic data structure resembling with the JSON objects.

BY Best Interview Question ON 05 Jun 2019