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

server/src/main/java/org/elasticsearch/TransportVersions.java

@@ -172,14 +172,14 @@ static TransportVersion def(int id) {
     public static final TransportVersion TIMEOUT_GET_PARAM_FOR_RESOLVE_CLUSTER = def(8_838_0_00);
     public static final TransportVersion INFERENCE_REQUEST_ADAPTIVE_RATE_LIMITING = def(8_839_0_00);
     public static final TransportVersion ML_INFERENCE_IBM_WATSONX_RERANK_ADDED = def(8_840_0_00);
-    public static final TransportVersion COHERE_BIT_EMBEDDING_TYPE_SUPPORT_ADDED_BACKPORT_8_X = def(8_840_0_01);
     public static final TransportVersion ELASTICSEARCH_9_0 = def(9_000_0_00);
     public static final TransportVersion COHERE_BIT_EMBEDDING_TYPE_SUPPORT_ADDED = def(9_001_0_00);
     public static final TransportVersion REMOVE_SNAPSHOT_FAILURES = def(9_002_0_00);
     public static final TransportVersion TRANSPORT_STATS_HANDLING_TIME_REQUIRED = def(9_003_0_00);
 
     public static final TransportVersion REMOVE_DESIRED_NODE_VERSION = def(9_004_0_00);
 
+    public static final TransportVersion VOYAGE_AI_INTEGRATION_ADDED = def(9_002_0_00);
     /*
      * STOP! READ THIS FIRST! No, really,
      *        ____ _____ ___  ____  _        ____  _____    _    ____    _____ _   _ ___ ____    _____ ___ ____  ____ _____ _

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

@@ -346,7 +346,7 @@ static SimilarityMeasure defaultSimilarity() {
 
     @Override
     public TransportVersion getMinimalSupportedVersion() {
-        return TransportVersions.JINA_AI_INTEGRATION_ADDED;
+        return TransportVersions.VOYAGE_AI_INTEGRATION_ADDED;
     }
 
     public static class Configuration {

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

@@ -131,7 +131,7 @@ public XContentBuilder toXContentFragmentOfExposedFields(XContentBuilder builder
 
     @Override
     public TransportVersion getMinimalSupportedVersion() {
-        return TransportVersions.JINA_AI_INTEGRATION_ADDED;
+        return TransportVersions.VOYAGE_AI_INTEGRATION_ADDED;
     }
 
     @Override

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

@@ -18,7 +18,7 @@
 import java.util.Map;
 
 /**
- * Defines the type of embedding that the cohere api should return for a request.
+ * Defines the type of embedding that the VoyageAI api should return for a request.
  *
  * <p>
  * <a href="https://docs.voyageai.com/reference/embeddings-api">See api docs for details.</a>
@@ -89,7 +89,7 @@ public static VoyageAIEmbeddingType fromElementType(DenseVectorFieldMapper.Eleme
 
             throw new IllegalArgumentException(
                 Strings.format(
-                    "Element type [%s] does not map to a Cohere embedding value, must be one of [%s]",
+                    "Element type [%s] does not map to a VoyageAI embedding value, must be one of [%s]",
                     elementType,
                     String.join(", ", validElementTypes)
                 )

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

@@ -90,7 +90,7 @@ protected XContentBuilder toXContentFragmentOfExposedFields(XContentBuilder buil
 
     @Override
     public TransportVersion getMinimalSupportedVersion() {
-        return TransportVersions.JINA_AI_INTEGRATION_ADDED;
+        return TransportVersions.VOYAGE_AI_INTEGRATION_ADDED;
     }
 
     @Override