Add version prefix to Inference Service API path (#117365)

Author: demjened

x-pack/plugin/inference/src/main/java/org/elasticsearch/xpack/inference/services/elastic/ElasticInferenceServiceSparseEmbeddingsModel.java

@@ -108,6 +108,6 @@ private URI createUri() throws URISyntaxException {
             default -> throw new IllegalArgumentException("Unsupported model for EIS [" + modelId + "]");
         }
 
-        return new URI(elasticInferenceServiceComponents().eisGatewayUrl() + "/sparse-text-embedding/" + modelIdUriPath);
+        return new URI(elasticInferenceServiceComponents().eisGatewayUrl() + "/api/v1/sparse-text-embedding/" + modelIdUriPath);
     }
 }