Search for a collection doesn't work in MTS

[osma]

At which URL did you encounter the problem?

http://dev.finto.fi/mts/fi/search?clang=fi&q=jakeluaika+tuntematon
http://finto.fi/mts/fi/search?clang=fi&q=jakeluaika+tuntematon

What steps will reproduce the problem?

1. Go to the Metadata vocabulary
2. Search for "jakeluaika tuntematon"

What is the expected output? What do you see instead?

Expected to find the collection http://urn.fi/URN:NBN:fi:au:mts:m2157 (http://finto.fi/mts/fi/page/m2157) which has the prefLabel "jakeluaika tuntematon" in Finnish, but there are no results.

[osma]

The problem was that MTS used groupClass isothes:ConceptGroup, but in the data the skos:Collection type is used alone. Changing the configuration to match the data fixed the problem.