[ML] Inference services - remove unused bits (#131759)

Author: davidkyle

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

@@ -11,7 +11,6 @@
 
 import org.elasticsearch.TransportVersion;
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.client.internal.Client;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.TimeValue;
 import org.elasticsearch.inference.validation.ServiceIntegrationValidator;
@@ -24,8 +23,6 @@
 
 public interface InferenceService extends Closeable {
 
-    default void init(Client client) {}
-
     String name();
 
     /**

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

@@ -9,7 +9,6 @@
 
 package org.elasticsearch.inference;
 
-import org.elasticsearch.client.internal.Client;
 import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
 
 import java.io.Closeable;
@@ -42,10 +41,6 @@ public InferenceServiceRegistry(
             .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
     }
 
-    public void init(Client client) {
-        services.values().forEach(s -> s.init(client));
-    }
-
     public void onNodeStarted() {
         for (var service : services.values()) {
             try {

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

@@ -357,7 +357,6 @@ public Collection<?> createComponents(PluginServices services) {
         // This must be done after the HttpRequestSenderFactory is created so that the services can get the
         // reference correctly
         var serviceRegistry = new InferenceServiceRegistry(inferenceServices, factoryContext);
-        serviceRegistry.init(services.client());
         for (var service : serviceRegistry.getServices().values()) {
             service.defaultConfigIds().forEach(modelRegistry.get()::addDefaultIds);
         }