Spring Data JPA: Query for Field in List of Objects

I'm looking for the correct method name to find all Documents with a given Target's type:

public class Document {

    @Indexed(name = "targets")
    private List<Target> targets;

    public class Target {
        private String value;
        private String type;
    }
}

Unfortunately, all of the following method names aren't working:

List<Document> findByTargetType(...);
List<Document> findByTargetsTargetType(...);
List<Document> findByTargetsContainsTargetType(...);
List<Document> findByTargetsContainsTargetTargetType(...);
List<Document> findByTargetsContainingTargetType(...);
List<Document> findByTargetsContainingTargetTargetType(...);

So which is the correct method name to accomplish the desired feature?