Elasticsearch's Cross-Cluster Search, introduced in version 5.3.0, enables users to perform searches across multiple clusters, overcoming the limitations of the previously used Tribe Node. Unlike the Tribe Node, which requires a separate node to join multiple clusters and manage cluster state updates, Cross-Cluster Search allows any node to act as the coordinating node without the need for additional nodes or complex configurations. This new functionality optimizes federated search by using the existing _search API, simplifying the process of merging and querying data across clusters. It addresses the Tribe Node's limitations, such as the inability to manage indices with the same name across different clusters and the requirement for node restarts when updating remote clusters. Furthermore, by managing memory consumption during search requests and aggregations, the new approach offers a more scalable and efficient solution, promising an improved user experience and setting the stage for future enhancements.