SortedDocValues dv = ireader.leaves().get(0).reader().getSortedDocValues("dv");
assertEquals(2, dv.getValueCount());
BytesRef scratch = new BytesRef();
assertEquals(0, dv.getOrd(0));
dv.lookupOrd(0, scratch);
assertEquals("hello world 1", scratch.utf8ToString());
assertEquals(1, dv.getOrd(1));
dv.lookupOrd(1, scratch);
assertEquals("hello world 2", scratch.utf8ToString());
assertEquals(0, dv.getOrd(2));