Add support for direct and nested projections#3894
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TODO: Field annotations on projection types no longer considered, simple DTO's without accessors not considered DTO projections, causes conversion issues.
Consider merged mapping metadata for DTO projections that may shadow entity properties or may contain additional Field annotations.
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Add tests for projections on dbref properties update java- and reference documentation. Original Pull Request: #3894
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MappingMongoConverternow is able to materialize projections without creating intermediate entities. That allows bypassing nullability restrictions of entities when e.g. using Kotlin. Interface projections are always backed by aMap, DTO projections use the target class to merge its metadata with the domain type metadata to e.g. allow overrides of field names.Depends on spring-projects/spring-data-commons#2420