This document provides an overview of Elastic Stack including ElasticSearch, Logstash, Kibana, and Beats. It discusses how Gemalto was using a monolithic solution to store logs from distributed systems and microservices, and wanted to implement a centralized scalable logging system. It describes various designs considered using Elastic Stack components like Logstash, Elasticsearch, and Filebeat to ingest, parse, store and visualize logs. Future plans discussed include using machine learning and Kafka.