public void testAddIndexes() throws IOException {
Directory d1 = newDirectory();
RandomIndexWriter w = new RandomIndexWriter(random(), d1);
Document doc = new Document();
doc.add(newStringField("id", "1", Field.Store.YES));
doc.add(new NumericDocValuesField("dv", 1));
w.addDocument(doc);
IndexReader r1 = w.getReader();
w.close();
Directory d2 = newDirectory();
w = new RandomIndexWriter(random(), d2);
doc = new Document();
doc.add(newStringField("id", "2", Field.Store.YES));
doc.add(new NumericDocValuesField("dv", 2));
w.addDocument(doc);
IndexReader r2 = w.getReader();
w.close();
Directory d3 = newDirectory();
w = new RandomIndexWriter(random(), d3);
w.addIndexes(SlowCompositeReaderWrapper.wrap(r1), SlowCompositeReaderWrapper.wrap(r2));
r1.close();
d1.close();
r2.close();
d2.close();
w.forceMerge(1);
DirectoryReader r3 = w.getReader();
w.close();
AtomicReader sr = getOnlySegmentReader(r3);
assertEquals(2, sr.numDocs());
NumericDocValues docValues = sr.getNumericDocValues("dv");
assertNotNull(docValues);
r3.close();
d3.close();
}
