ParsedDocument d = mapper.parse("test", "1", doc.bytes());
writer.addDocument(d.rootDoc());
byte[] bytes1 = randomBytes();
doc = XContentFactory.jsonBuilder().startObject().field("field", bytes1).endObject();
d = mapper.parse("test", "2", doc.bytes());
writer.addDocument(d.rootDoc());
doc = XContentFactory.jsonBuilder().startObject().endObject();
d = mapper.parse("test", "3", doc.bytes());
writer.addDocument(d.rootDoc());