Set correct type identification during deserialization (elastic#138847)

Author: demjened

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/InferenceNamedWriteablesProvider.java

@@ -79,6 +79,7 @@
 import org.elasticsearch.xpack.inference.services.custom.response.TextEmbeddingResponseParser;
 import org.elasticsearch.xpack.inference.services.deepseek.DeepSeekChatCompletionModel;
 import org.elasticsearch.xpack.inference.services.elastic.completion.ElasticInferenceServiceCompletionServiceSettings;
+import org.elasticsearch.xpack.inference.services.elastic.densetextembeddings.ElasticInferenceServiceDenseTextEmbeddingsServiceSettings;
 import org.elasticsearch.xpack.inference.services.elastic.rerank.ElasticInferenceServiceRerankServiceSettings;
 import org.elasticsearch.xpack.inference.services.elastic.sparseembeddings.ElasticInferenceServiceSparseEmbeddingsServiceSettings;
 import org.elasticsearch.xpack.inference.services.elasticsearch.CustomElandInternalServiceSettings;
@@ -857,5 +858,14 @@ private static void addElasticNamedWriteables(List<NamedWriteableRegistry.Entry>
                 ElasticInferenceServiceRerankServiceSettings::new
             )
         );
+
+        // Dense Text Embeddings
+        namedWriteables.add(
+            new NamedWriteableRegistry.Entry(
+                ServiceSettings.class,
+                ElasticInferenceServiceDenseTextEmbeddingsServiceSettings.NAME,
+                ElasticInferenceServiceDenseTextEmbeddingsServiceSettings::new
+            )
+        );
     }
 }