Micronaut: JPA batch update operations is not working for postgresql - postgresql

Question

I'm trying to run batch operations in my Micronaut app.
Currently, I can run insert operations in batch (with reWriteBatchedInserts option activated) but the configuration is not working for updates.
Something special about my app is that I want to set the id manually.
This is my entity:
#Data
#Entity
#SuperBuilder
#NoArgsConstructor
#Table(name = "PRODUCT")
public class ArticleItem implements Cloneable, Serializable {
#Id
#Column
private Long id;
The service:
#Singleton
#Slf4j
public class ArticleServiceImpl implements ArticleService {
#Transactional
public List<GenericSingleResponse> internalSaveArticles(
List<ArticleItem> articleItemList,
Integer erp, String traceId, String json
) {
articlePort.saveAll(insertList);
The port:
#Singleton
public class ArticlePortImpl implements ArticlePort {
private final EntityManager entityManager;
#Transactional
public void updateAll(List<ArticleItem> articleItemList) {
articleItemList.forEach(f -> entityManager.merge(f));
}
The configuration:
datasources:
default:
url: jdbc:postgresql://localhost:5432/postgres?reWriteBatchedInserts=true
jpa:
default:
properties:
hibernate:
hbm2ddl:
auto: none
jdbc:
batch_size: 100
batch_versioned_data: true
order_inserts: true
order_updates: true
batch_versioned_data: true
show_sql: false
id:
optimizer:
pooled:
preferred: pooled-lo