如何在使用mongodb(spring boot)执行搜索/查找操作时重命名字段？

import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.Fields;
import import org.springframework.data.mongodb.core.aggregation.ProjectionOperation;

ProjectionOperation project = Aggregation.project()
    .and(Fields.field("oldFieldName")).as("newFieldName");

Aggregation aggregation = Aggregation.newAggregation(project);
List<Document> results = mongoTemplate.aggregate(aggregation, "collectionName", Document.class).getMappedResults();