MongoJobRepositoryFactoryBean requirement for MapKeyDotReplacement should be enforced

The Javadoc of MongoJobRepositoryFactoryBean provides all the need that you need https://github.com/spring-projects/spring-batch/blob/0c91fa4daba99d81f09de405cd0463ab3d0fde16/spring-batch-core/src/main/java/org/springframework/batch/core/repository/support/MongoJobRepositoryFactoryBean.java#L33-L37

However, this concretely makes you create a MongoTemplate for the purpose of Spring Batch as such requirement is unusual.

I am not an expert but asked @mp911de and he's suggesting to:

not use dots in field/property names and instead do the translation differently, by e.g. creating a subdocument after a property terminates at a dot.

If that's not practical, I'd suggest to deprecate protected MongoOperations getMongoOperations() and create one using MongoDatabaseFactory (that should be provided as a new getter).

Start by reading the Javadoc and implementation of MongoJobRepositoryFactoryBean, especially the MapKeyDotReplacement requirement and protected getMongoOperations() mentioned in the issue. Compare the proposed MongoOperations and MongoDatabaseFactory alternatives, then establish which API and field-name behavior should change before defining completion criteria.