Starting with Elastic Stack versions 6.8 and 7.1, security features such as TLS encrypted communication and role-based access control (RBAC) are available for free, enabling users to secure their Elasticsearch clusters effectively. The blog post provides a practical guide on setting up these security features by creating and securing a two-node Elasticsearch cluster on a local machine. It outlines steps for configuring TLS between nodes, enabling security in Kibana, and setting up RBAC to ensure users have access only to authorized data. The process involves downloading and setting up Elasticsearch and Kibana, creating certificates for secure communication, configuring roles and users in Kibana, and ensuring proper access control. The post emphasizes that while the guide covers essential security setup, there are many additional features and capabilities within the Elastic Stack security framework to explore, encouraging users to refer to comprehensive documentation for further learning.