对于那些仍在寻找答案的人：
从spring-data-mongo版本2.0.0.M4开始（ ）MongoTemplate得到了一种aggregateStream方法。
因此，您可以执行以下操作：
AggregationOptions aggregationOptions = Aggregation.newAggregationOptions()
// this is very important: if you do not set the batch size, you'll get all the objects at once and you might run out of memory if the returning data set is too large
.cursorBatchSize(mongoCursorBatchSize)
.build();
data = mongoTemplate.aggregateStream(Aggregation.newAggregation(
Aggregation.group("person_id").count().as("count")).withOptions(aggregationOptions), collectionName, YourClazz.class);
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