Updated Technology
The updated version of PubMed uses Solr, an open-source enterprise search system, for document indexing, and MongoDB for storage and retrieval (see Figure 4). In addition to its scalability and reliability, Solr also provides many powerful out-of-the-box search functionalities, such as wildcards (‘*’), groupings, and joins. For example, unlike the current production PubMed, the updated version does not limit the number of variants for wildcards. The MongoDB storage solution provides default data replication between different data centers, which ensures redundancy. The updated PubMed runs on a modern cloud architecture that provides scalability and a reliable backup environment.
The updated PubMed uses the Django Web framework on the front-end, making use of the latest web technologies and standards.
https://www.nlm.nih.gov/pubs/techbull/ma19/ma19_pubmed_updat...
is this effort limited to frontend / user experience or is pubmed changing on the backend side too ? (storage, analytics, etc)