// Create a UID object for the Value
Builder uidBuilder = Uid.List.newBuilder();
uidBuilder.setIGNORE(false);
uidBuilder.setCOUNT(1);
uidBuilder.addUID(Integer.toString(article.getId()));
Uid.List uidList = uidBuilder.build();
Value val = new Value(uidList.toByteArray());
// Create mutations for the global index
// Row is field value, colf is field name, colq is partitionid\0language, value is Uid.List object
Mutation gm = new Mutation(index.getValue());