docs.add(document);
document = new Document();
document.add(new StringField("__type", "parent", Field.Store.NO));
document.add(new StringField("field1", "g", Field.Store.NO));
docs.add(document);
w.addDocuments(docs);
// This doc will not be included, because it doesn't have nested docs
document = new Document();
document.add(new StringField("__type", "parent", Field.Store.NO));
document.add(new StringField("field1", "h", Field.Store.NO));