Is it possible to use Spring's annotations to define Completion Suggester for a mapping in Elasticsearch?
Absolutely yes..
you can configure your entity like this:
...import org.springframework.data.elasticsearch.core.completion.Completion;...@Document(indexName = "test-completion-index", type = "annotated-completion-type", indexStoreType = "memory", shards = 1, replicas = 0, refreshInterval = "-1")public class YoutEntity { @Id private String id; private String name; @CompletionField(payloads = true, maxInputLength = 100) private Completion suggest; ...}Check this link for example.
I am not experienced with that, but maybe this annotation can be helpful for you:
Link to Spring Data Elasticsearch documentation