如何使用合成的对象字段生成couchbase密钥（使用\属性）
例如-我希望student（rollnumber）和branchid（branchid）作为文档的键。下面的代码在我的couchbase中保存学生文档时忽略branchid作为键

//***Student Class***
    @EqualsAndHashCode
    @AllArgsConstructor
    @NoArgsConstructor
    @Getter
    @Setter
    @Builder
    @Document    
    public class Student {
            @Id
            @GeneratedValue(strategy = USE_ATTRIBUTES)
            private String id;
            @Field
            private String name;
            @Field
            @IdAttribute(order = 1)
            private long rollNumber;
            @Field
            private String Branch
        }

//***Branch Class***
    @EqualsAndHashCode
    @AllArgsConstructor
    @NoArgsConstructor
    @Getter
    @Setter
    @Builder
    public class Branch{
            @Field
            @IdAttribute(order = 2)
            private String branchId;
            @Field
            private long branchName;
    }