Unable to override Auditable fields - createdAt - mongodb

Question

I've access_tokens collection and here is the corresponding class:
public class AccessToken extends Auditable {
#Id
private String id;
#NotBlank
private String token;
#DBRef
#NotBlank
private User user;
#NotBlank
private String origin;
public void setOrigin(String origin) {
this.origin = JwtUtils.getOrigin(origin);
}
#Indexed(expireAfter = "1d")
private LocalDateTime createdAt;
}
And here is the Auditable class:
public class Auditable {
#CreatedDate
private LocalDateTime createdAt;
#LastModifiedDate
private LocalDateTime updatedAt;
#CreatedBy
private ObjectId createdBy;
#LastModifiedBy
private ObjectId updatedBy;
}
The reason I'm defining createdAt in AccessToken is, I want to create a TTL index (basically I want to delete all access tokens after one day). But I'm getting following error:
Caused by: org.springframework.data.mapping.MappingException: Ambiguous field mapping detected! Both #org.springframework.data.annotation.CreatedDate()private java.time.LocalDateTime com.iof.models.Auditable.createdAt and private java.time.LocalDateTime com.iof.models.AccessToken.createdAt map to the same field name createdAt! Disambiguate using #Field annotation!
How can I solve this?