1) Upload a model
https://opensearch.org/docs/latest/ml-commons-plugin/ml-framework/#example-request
2) Embeddings with the model
https://opensearch.org/docs/latest/search-plugins/neural-search/#example-request
3) Hybrid semantic search with filters and aggregations.
WPSOLR + WooCommerce + #OpenSearch (vectors soon?): https://wpsolr.com