In Kibana version 6.3, significant improvements were introduced to its query language, focusing on simplifying syntax and enhancing user experience by removing the complex functional syntax and refining the basic query syntax. This new language resembles the familiar Lucene query syntax, making it accessible for existing users, while introducing features such as autocomplete, which suggests fields, values, and operators to streamline query building. The changes are a direct response to user feedback and aim to unify the query and filter bars without causing confusion. Users can easily opt into the new language via the query bar's options, and further developments are anticipated as the language evolves, driven by ongoing user contributions and feedback.