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javaelasticsearchspring-data-elasticsearch

Can we fetch the metadata `_version` of existing document using Spring-data-elasticsearch?

I am implementing a feature where I need to compare the metadata version of an existing document before indexing it and I have a version attribute in my object which can't be the same as the metadata version. Can I fetch the metadata version explicitly in code, so that I can compare ? I am using spring-data-elasticsearch. I will appreciate any help.

Solution

  • You just have to add a property annotated with @Version to your entity, for example:

    @Document(indexName = "person")
public class Person {

    @Id
    @Nullable
    private Long id;

    @Nullable @Version
    Long version;

    // other properties, getter and setter
}

    When reading entities with Spring Data Elasticsearch, this property - which must be a Long - will be set to the value returned from Elasticsearch.