MongoDB批量更新和批量插入的方式

@Autowired
private MongoTemplate mongoTemplate;
（1）批量插入示例如下：
List<Object> insertDataList;
BulkOperations operations = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, collectionName);
insertDataList.forEach((key, value) -> {
    operations.insert(mongoData)
})
BulkWriteResult result = operations.execute();
（2）批量修改示例如下：
List<Object> updateDataList;
BulkOperations operations = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, collectionName);
updateDateList.forEach(date -> {
   Query queryUpdate = new Query();
   queryUpdate.addCriteria(where("_id").is(value));
   Update update = new Update();
   update.set(field1, value1).set(field2, value2);
   operations.updateOne(queryUpdate, update);
});
BulkWriteResult result = operations.execute();

（3）利用BulkOperations的upsert方法可以同时支持插入和更新操作，示例如下：
List<T> dataList = new ArrayList<>()；
List<Pair<Query, Update>> updateList = new ArrayList<>(dataList.size());
BulkOperations operations = mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, collectionName);
dataList.forEach(data -> {
 Query query = new Query(new 
 Criteria(field1).is(value1)).addCriteria(new Criteria(field2).is(value2));
 Update update = new Update();
 for (int index = 0; index < ; index++) {
    String key = data.getKey();
    String value = data.getValue();
 　　update.set(key, value);
 }
 Pair<Query, Update> updatePair = Pair.of(query, update);
 updateList.add(updatePair);
});
operations.upsert(updateList);
BulkWriteResult result = operations.execute();

备注：BulkOperations.BulkMode.UNORDERED 和 BulkOperations.BulkMode.ORDERED的区别：
UNORDERED是平行处理，即使某条记录出错了，其余的也会继续处理；

ORDERED是队列排序处理，只要中途有个失败了，那么后续的操作流程就会终止了。
enum BulkMode {

   /** Perform bulk operations in sequence. The first error will cancel processing. */
   ORDERED,

   /** Perform bulk operations in parallel. Processing will continue on errors. */
   UNORDERED
};