builder.find(new BasicDBObject("_id", 1)).updateOne(new BasicDBObject("$set", new BasicDBObject("x", 2)));
builder.find(new BasicDBObject("_id", 2)).removeOne();
builder.find(new BasicDBObject("_id", 3)).replaceOne(new BasicDBObject("_id", 3).append("x", 4));
BulkWriteResult result = builder.execute();
System.out.println("Ordered bulk write result : " + result);
// Unordered bulk operation - no guarantee of order of operation
builder = coll.initializeUnorderedBulkOperation();
builder.find(new BasicDBObject("_id", 1)).removeOne();