The heart of ELK (our custom stack) is Elasticsearch, which is distributed like Apache Cassandra with a different architecture, a RESTful search, and an analytics storage engine. This is where all the logs shipped from Filebeat and are stored, based on our retention policy. Logs are retained to discover faulty nodes and the reason for their faultiness. The best part is its capability to manage unstructured and structured numbers and text, on a single datastore. Refer to the Elasticsearch docs for more information at Elastic-Docs: Elasticsearch: https://www.elastic.co/products/elasticsearch.
Elasticsearch
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