How to use Spring Data ElasticSearch to set the @timestamp field?

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To set the @timestamp field in Spring Data Elasticsearch, you can use the @Field annotation with the index parameter set to true and the name parameter set to “@timestamp”. Here is an example:

import org.springframework.data.elasticsearch.annotations.*;

@Document(indexName = "my_index", type = "my_type")
public class MyDocument {

    @Id
    private String id;

    @Field(index = true, name = "@timestamp", type = FieldType.Date)
    private Date timestamp;

    // getters and setters
}

In this example, the @timestamp field is mapped to a Java Date object using the FieldType.Date. When you save this document using an ElasticsearchRepository, the @timestamp field will be automatically populated with the current timestamp.

Note that the @timestamp field is a special field in Elasticsearch that is used for time-based queries and aggregations. It is automatically indexed and cannot be deleted.