// Note: currently this is implemented for IteratorSearches only! TBD for Flat and Grouped searches
// my use case: searching across multiple contexts, querying how many combinations of GAs exists in groupId
// "org.slf4j".
Query query = nexusIndexer.constructQuery( MAVEN.GROUP_ID, new SourcedSearchExpression( "org.slf4j" ) );
IteratorSearchRequest isReq = new IteratorSearchRequest( query );
// so, how many different GA combinations exists, this is almost equal to SQLs group by "groupId, artifactId"
isReq.setArtifactInfoFilter( new UniqueArtifactFilterPostprocessor( new HashSet<Field>( Arrays.asList(