Is the raw_values facet/filter type ever used?

[kosarko]

We've defined an additional type https://github.com/ufal/clarin-dspace/blob/9b3baef1a609a1d691c48d54450192fd268341b0/dspace-api/src/main/java/org/dspace/discovery/configuration/DiscoveryConfigurationParameters.java#L24 (see the patch and the original issue in the attached zip raw_values.zip)

but the only usage at https://github.com/ufal/clarin-dspace/blob/9b3baef1a609a1d691c48d54450192fd268341b0/dspace/config/spring/api/discovery.xml#L629 was commented long time ago