Elastic Stack 6.4.0 introduces a range of new features and enhancements across its components, aiming to improve flexibility, efficiency, and user experience. The update includes Elastic APM enhancements like support for Logstash and Apache Kafka outputs, an integrated machine learning feature for anomaly detection, and the general availability of several APM agents. Elasticsearch adds support for Kerberos authentication, FIPS 140-2 compliance, a reloadable keystore, and a more efficient Korean language analyzer. Kibana offers a one-click sample data feature, a redesigned spy panel, and improved machine learning job management. Logstash introduces an Azure module for cloud monitoring, a new file input read mode, and a faster HTTP input plugin. Beats expands with new modules and processors, while ES-Hadoop sees the general availability of an error handler API and support for secure settings. These enhancements collectively aim to increase the power and usability of the Elastic Stack for data analysis and monitoring.