doc = new Document();
addGroupField(doc, groupField, "author2", canUseIDV);
doc.add(new TextField("content", "some random text", Field.Store.YES));
doc.add(new Field("id", "4", customType));
doc.add(new StringField("groupend", "x", Field.Store.NO));
w.addDocument(doc);
// 4
doc = new Document();
addGroupField(doc, groupField, "author3", canUseIDV);
doc.add(new TextField("content", "some more random text", Field.Store.YES));