Merge branch '63-listsets-is-not-delivering-all-sets' into 'develop'

fix: try more logging

Closes #63

See merge request dariah-de/dariah-de-oai-pmh-services!28

oaipmh-core/src/main/java/info/textgrid/middleware/SetListDeliverer.java

@@ -150,7 +150,7 @@ public class SetListDeliverer {
       log.info("collectionFilterTerm metadasta entryset: "
           + collectionFilterTerm.getMetaData().entrySet());
 
-      collectionFilter.subAggregation(OLDcollectionFilterTerm);
+      OLDcollectionFilter.subAggregation(OLDcollectionFilterTerm);
       searchSourceBuilder.aggregation(OLDcollectionFilter);
     }