Elasticsearch

Elasticsearch open-source highly scalable search engine. It is used to store, search, and analyze big volumes of data quickly and in underlying engine/technology that powers applications that have complex search features and requirements.

Elasticsearch enhances to store your entire product catalog and inventory and provide search and auto complete suggestions, when you are running an online store. It has the ability to search all kinds of documents and supports multitenancy.

It is  developed alongside a data-collection and log-parsing engine called Logstash, and an analytics and visualization platform called Kibana. The combination of three products are designed for use as an integrated solution, referred to as the “Elastic Stack”.

Related data is often stored in the same index, which consists of one or more primary shards, and zero or more replica shards. Where indices can be divided into shards and each shard can have zero or more replicas.