DynamoDB/Jackson removing 'is' prefix from property name of the entity

Question

Not sure if this issue is related to DynamoDB, Jackson, or something else.

The prefix is is being removed from the field isPrimary while writing, saving with the name primary instead in DynamoDB.

Not able to get the record based on this field because:

1. There's no column/field in dynamo DB as isPrimary
2. When trying to query with the field name primary, DynamoDbMapper throws an exception saying primary is a reserved keyword and can not be used in the query.

Tryied using @JsonProperty(value = "isPrimary") and @DynamoDBAttribute(attributeName = "isPrimary") individually and both together, non of these work.

Using DynamoDBMapper

Entity Class

@Data
@Accessors(chain = true)
@DynamoDBTable(tableName = "my-data-table")
public class MyData {

    @DynamoDBHashKey(attributeName = "id")
    private String id;

    @DynamoDBRangeKey(attributeName = "otherId")
    private String otherId;

    private String name;

    @DynamoDBAttribute(attributeName = "isPrimary")
    @JsonProperty(value = "isPrimary")
    private boolean isPrimary;
    
    @DynamoDBVersionAttribute
    private Long version;
}

Read operation based on id and isPrimary=true

public Optional<MyData> findPrimaryData(String id) {
    Map<String, AttributeValue> entityAttributeMap = new HashMap<>();
    entityAttributeMap.put(":id", new AttributeValue().withS(id));
    entityAttributeMap.put(":isPrimary", new AttributeValue().withBOOL(true));

    DynamoDBQueryExpression<MyData> queryExpressionExp = new DynamoDBQueryExpression<MyData>()
        .withKeyConditionExpression("id = :id")
        .withFilterExpression("isPrimary = :isPrimary")
        .withExpressionAttributeValues(entityAttributeMap)
        .withLimit(1);

    List<MyData> list = dynamoDBMapper.query(MyData.class, queryExpressionExp);
    if (list.isEmpty()) {
        return Optional.empty();
    }
    return Optional.ofNullable(list.get(0));
}

Write operation to make isPrimary=true for given id and otherId rest false

public void activate(String id, String otherId) {
    Map<String, AttributeValue> entityAttributeMap = new HashMap<>();
    entityAttributeMap.put(":id", new AttributeValue().withS(id));

    DynamoDBQueryExpression<MyData> queryExpression = new DynamoDBQueryExpression<MyData>()
        .withKeyConditionExpression("id = :id")
        .withExpressionAttributeValues(entityAttributeMap);

    List<MyData> list = dynamoDBMapper.query(MyData.class, queryExpression);
    if (list.isEmpty()) {
        throw new ResourceNotFoundException("MyData", "id", id);
    }
    list.stream()
        .forEach(item ->
            item.setPrimary(idPEntityItem.getOtherId().equals(otherId))
        );
    list.forEach(dynamoDBMapper::save);
}