api: fix mongo indexes

API/src/main/java/cc/fascinated/model/score/Score.java

@@ -7,6 +7,7 @@ import lombok.AllArgsConstructor;
 import lombok.Getter;
 import lombok.Setter;
 import org.springframework.data.annotation.Id;
+import org.springframework.data.annotation.Reference;
 import org.springframework.data.mongodb.core.index.Indexed;
 import org.springframework.data.mongodb.core.mapping.Document;
 
@@ -102,6 +103,7 @@ public class Score {
     /**
      * The score history for map the score was set on.
      */
+    @Reference
     private List<Score> previousScores;
 
     /**

API/src/main/java/cc/fascinated/repository/ScoreRepository.java

@@ -13,7 +13,6 @@ import java.util.List;
  * @author Fascinated (fascinated7)
  */
 public interface ScoreRepository extends MongoRepository<Score, String> {
-
     /**
      * Gets the top ranked scores from the platform.
      *