The overarching goal of ENVRI-FAIR is for all participating RIs to improve their FAIRness and prepare the connection of their data repositories and services to the European Open Science Cloud. With the development of FAIR implementations from the participating RIs and integrated services among the environmental subdomains, these data and services will be brought together at a higher level (for the entire cluster), providing more efficient services for researchers and policy makers. This deliverable presents new developments to the knowledge base, initially presented in the ENVRI-FAIR Deliverable 7.3. The new developments focus on the knowledge base search engine. We introduce a new automated pipeline to index online resources: web pages, datasets, and computational notebooks. We also present a complete redesign of the search engine and interface. These new features were deployed in a cloud environment, making the service more performant and reliable. We also discuss the integration with the ENVRI community through the ENVRI-Hub and show a demonstration of the new search engine. By allowing users to find resources from ENVRI and its RIs, the knowledge base search engine improves interoperability.