The document discusses centralized logging with the Elastic Stack. It describes the components of the Elastic Stack including Beats, Logstash, Elasticsearch, and Kibana. It explains how Beats collects log data and sends it to Logstash for ingestion into Elasticsearch for storage, search, and analysis. Kibana is used for visualizing and managing the logged data. The document provides an example of using the Elastic Stack with Filebeat, Logstash, and Elasticsearch for log ingestion and analysis of access logs from a web server. It discusses benefits like reduced costs using a hot-warm architecture with the Elastic Stack.