addGroupField(doc, groupField, "author1", canUseIDV);
doc.add(new TextField("content", "some more random textual data", Field.Store.YES));
doc.add(new Field("id", "3", customType));
doc.add(new StringField("groupend", "x", Field.Store.NO));
documents.add(doc);
w.addDocuments(documents);
documents.clear();
// 3
doc = new Document();
addGroupField(doc, groupField, "author2", canUseIDV);