Save composite key data to elastic search document - elasticsearch

Question

I am using hibernate envers to audit the data for my tables and save in Oracle DB. This auditing data I am reading and saving to elastic search index through Java code using spring data elastic search. I have a composite key (id and rev) which defines a unique row to save data but for elastic search I can't provide a composite key. It is taking only rev (identifier) column and replacing data.
Hibernate envers background information:
rev is the default identifier that hibernate is providing and for list of records which modified at same time, it creates same rev id:
Eg: id rev comments
1 1 newly created
2 1 newly created
1 2 modified
2 2 modified
First 2 rows are created at same time and next time I modified both the rows and updated so hibernate envers creates same rev id for 1 save.
#Entity
#IdClass(MyEmbeddedId.class)
#Document(indexName = "#{#indexName}", type = "my-document", shards = 1, replicas = 0, refreshInterval = "-1")
#Getter #Setter
public class MyClassAudit {
#Id
private Long id;
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
#org.springframework.data.annotation.Id --> (this is for elastic search _id)
private Long rev;
}
#Getter #Setter
public class MyEmbeddedId implements Serializable {
private Long id;
private Long rev;
}
Java code:
List<MyClass> list = repository.findById(id);
elasticSearchRepository.saveAll(list)
Elastic search repository interface:
public interface MyElasticSearchRepository extends GenericSearchRepository<MyClassAudit, Long> {}
When I save data to elastic search then all 4 records should be saved as given in example but only 2 records are saved like below:
_id id rev comments
1 2 1 newly created
2 2 2 modified
It is because rev is taken as identifier in elastic search and 2nd record is being updated.
How to make elastic search to consider composite key to maintain unique records?
PS: _id is the elastic search identifier. since rev is having spring data annotation id, rev is considered as identifier in elastic search

Answer 1

Elasticsearch itself has no concept of a composite key. Spring Data Elasticsearch takes the #Id annotated element and uses it's toString() method to create the id entry for Elasticsearch (and stores the field as well in the source).
So - without haven't tried - you could use your MyEmbeddedId class as a field property of your MyClassAudit class and annotate it with #Id. But you have to have this property in your class, it will not be synthesized.
This will probably conflict with the annotations for hibernate, but I don't think it's a good idea to share one entity between storages and using mixed annotations.