On September 18, 2018, Paul Sanwald announced the release of Elastic Stack version 6.4.1, which primarily focuses on addressing significant bugs present in the previous version. Key bug fixes include enabling query caching by default for the standard distribution, resolving an issue that prevented 6.4.0 nodes from restarting after rollovers, and correcting the installation path for the modules.d directory in the Metricbeat DEB and RPM packages. This update aims to enhance the functionality and reliability of the Elastic Stack platform.