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Invalid reference 'rules.ruleType'!
java.lang.IllegalArgumentException: Invalid reference 'PDch'!	at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:63)	at org.springframework.data.mongodb.core.aggregation.ExposedFieldsAggregationOperationContext.getReference(ExposedFieldsAggregationOperationContext.java:47)	at org.springframework.data.mongodb.core.aggregation.GroupOperation.toDBObject(GroupOperation.java:284)	at org.springframework.data.mongodb.core.aggregation.Aggregation.toDbObject(Aggregation.java:228)