Great project! Elasticsearch / OpenSearch / Solr have their own learning to rank plugins. Have you considered integrating Metarank with such systems? Or is your vision to provide a reranker layer, that can be independent of the underlying search engine architecture?
We were considering creating a plugin for elasticsearch, but there's already one (ES-LTR) and such architecture limits the ability to create a good multi-purpose system.
We're still considering building plugins to easier integrate with existing search technologies and will keep an open eye on the demand for this.
