alias elser service to elasticsearch

Author: Max Hniebergall

server/src/main/java/org/elasticsearch/inference/InferenceServiceRegistry.java

@@ -46,8 +46,14 @@ public Map<String, InferenceService> getServices() {
     }
 
     public Optional<InferenceService> getService(String serviceName) {
+
+        if ("elser".equals(serviceName)) { // ElserService.NAME before removal
+            // here we are aliasing the elser service to use the elasticsearch service instead
+            return Optional.ofNullable(services.get("elasticsearch")); // ElasticsearchInternalService.NAME
+        } else {
         return Optional.ofNullable(services.get(serviceName));
     }
+    }
 
     public List<NamedWriteableRegistry.Entry> getNamedWriteables() {
         return namedWriteables;