public void setNextReader(AtomicReaderContext context) {
   docMap.setNextReader(context);
   sourceLookup.setNextReader(context);
   fieldsLookup.setNextReader(context);
   indexLookup.setNextReader(context);
 }
 public void setNextDocId(int docId) {
   docMap.setNextDocId(docId);
   sourceLookup.setNextDocId(docId);
   fieldsLookup.setNextDocId(docId);
   indexLookup.setNextDocId(docId);
 }
 public void setScorer(Scorer scorer) {
   docMap.setScorer(scorer);
 }