Add script to term

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

@@ -122,11 +122,14 @@ public class SetDeliverer {
     // Assemble DH ES request.
     else if (this.dariah) {
 
+      Script collectionID = new Script("doc['administrativeMetadata:dcterms:identifier'].value");
+
       AggregationBuilder filterCollections = AggregationBuilders.filter("collectionFilter",
           QueryBuilders.boolQuery().must(QueryBuilders.matchPhraseQuery(
               "descriptiveMetada.dc:format", TextGridMimetypes.DARIAH_COLLECTION)));
 
-      AggregationBuilder filterTerm = AggregationBuilders.terms("collectionTerm").size(DH_SIZE);
+      AggregationBuilder filterTerm =
+          AggregationBuilders.terms("collectionTerm").script(collectionID).size(DH_SIZE);
 
       filterCollections.subAggregation(filterTerm);