Multivalued attributes are fundamental to e-commerce: think about product variations with several prices per combination of sizes and colours for instance.
Being able to sort, filter, and aggregate (faceting) on product attributes with keywords, vectors or hybrid mode is not only important but mandatory.
You can monitor our progress on this roadmap: https://lnkd.in/eA6hCN3M
WPSOLR + Vespa (soon!): https://wpsolr.com