S3 Catalog URL?

Does anyone know the catalog query URL for S3? The logical choice https://scihub.copernicus.eu/s3/search?rows=1000000&q=productType::OL_1_EFR___ throws an error.

This page suggests product types without trailing _, but they don’t work either.

I don’t know the reason why it is not working. But it seems that the OLCI data is currently distributed via a special scihub instance. In the default scihub you can’t find the new OLCI data yet. This could be a reason.