Mongodb的 mongoTemplate 内嵌文档怎么进行查询？

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Criteria criteria = new Criteria()andOperator(
Criteriawhere("createDate")gte(dateFormatparseObject("2014-10-01 00:00:00")),
Criteriawhere("createDate")lt(dateFormatparseObject("2014-11-01 00:00:00"))
);
mongoTemplategroup(criteria, "collectionName", new GroupBy("GroupField"), entityClass);
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<dependency>
<groupId>orgmongodb</groupId>
<artifactId>mongo-java-driver</artifactId>
<version>2123</version>
</dependency>

一、选择通信协议
之前写的项目并发量很小，>