VoyageAI embeddings and rerank:

 - embeddings works, tested
 - rerank works, tested (https://www.elastic.co/search-labs/blog/elasticsearch-cohere-rerank)

What's missing:
 - unit and integration tests

Author: fzowl

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/external/request/voyageai/VoyageAIEmbeddingsRequestEntity.java

@@ -17,7 +17,7 @@
 import java.util.List;
 import java.util.Objects;
 
-import static org.elasticsearch.xpack.inference.services.cohere.embeddings.CohereEmbeddingsTaskSettings.invalidInputTypeMessage;
+import static org.elasticsearch.xpack.inference.services.voyageai.embeddings.VoyageAIEmbeddingsTaskSettings.invalidInputTypeMessage;
 
 public record VoyageAIEmbeddingsRequestEntity(
     List<String> input,

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/voyageai/VoyageAIServiceSettings.java

@@ -38,7 +38,7 @@ public class VoyageAIServiceSettings extends FilteredXContentObject implements S
     public static final String NAME = "voyageai_service_settings";
     public static final String MODEL_ID = "model_id";
     private static final Logger logger = LogManager.getLogger(VoyageAIServiceSettings.class);
-    // See https://jina.ai/contact-sales/#rate-limit
+    // See https://docs.voyageai.com/docs/rate-limits
     public static final RateLimitSettings DEFAULT_RATE_LIMIT_SETTINGS = new RateLimitSettings(2_000);
 
     public static VoyageAIServiceSettings fromMap(Map<String, Object> map, ConfigurationParseContext context) {