Null fields when I use @JsonProperty for retrieve object from MongoDB by Spring data

I have some problem with Spring JPA, MongoDB and Jackson when I use @JsonProperty to use a different name for the json/db and java field. I receive json and save them into collections, for example

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Document(collection="message")
public class Message implements java.io.Serializable{

    private static final long serialVersionUID = 1L;

    @Id
    private String id;

    @JsonProperty("raw")
    private Raw raw;

    @JsonProperty("meta")
    private Meta meta;      
}

with Raw :

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Document(collection="raw")
public class Raw {

    private String dlc;

    @JsonProperty("can_id")
    private String canId;

    @JsonProperty("can_data")
    private String canData;
}

I'm using lombok for the get,set and constructor. I had the message into database before change the field name (using for instance canData instead of can_data) and when I retrieved the object from database this renamed fields were null. So I removed the message and stored again and finally work, I made this because into mongodb I see _class:"com.domain.Message".
This is the first problem: every time I change my java class all the stored data give me this problem?
But I have problem even with manually inserted json into Mongodb: the fields where I use @JsonProperty are null when I make the query like this:

@Query("{ 'can_id' : ?0 }")
Severity findByCanId(String canId);

Severity is so:

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Document(collection="severity")
public class Severity implements java.io.Serializable{

    private static final long serialVersionUID = 1L;

    @JsonProperty("can_id")
    @Indexed
    private String canId;       

    @JsonProperty("can_name")
    private String canName;

    private Integer ss;

    private Integer ps;

    private Integer fs;

    private Integer os;
}

The query return me a Severity object with canId and canName null. Do you know how can I fix this problem? Thanks