When reading a persisted document @Nullable annotations should be handled [DATAMONGO-1160]

Christian Schneider opened DATAMONGO-1160 and commented

The MongoDB Mapper should read @Nullable Annotations on constructors.

The attached example shows our need to add an dedicated @PersistanceConstructor.
The author tried to put an @Nullable but he still got an exception.
In our case the Throwable cause argument is transient.

The same should be possible with Optionals.

To clarify: My actual concern with this ticket is that we don't like to add an own constructor when using @transient to make the spring-data-mapping work

Affects: 1.6.2 (Evans SR2)

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