Remove main action service.

Signed-off-by: Finn Carroll <carrofin@amazon.com>

plugins/transport-grpc/src/main/java/org/opensearch/transport/grpc/GrpcModulePlugin.java

@@ -30,7 +30,6 @@
 import org.opensearch.script.ScriptService;
 import org.opensearch.telemetry.tracing.Tracer;
 import org.opensearch.threadpool.ThreadPool;
-import org.opensearch.transport.grpc.actions.MainActionService;
 import org.opensearch.watcher.ResourceWatcherService;
 
 import java.util.Collection;
@@ -40,8 +39,6 @@
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-import io.grpc.BindableService;
-
 import static java.util.Collections.emptyList;
 import static org.opensearch.common.settings.Setting.intSetting;
 import static org.opensearch.common.settings.Setting.listSetting;
@@ -99,8 +96,7 @@ public Collection<Object> createComponents(
         if (FeatureFlags.isEnabled(FeatureFlags.GRPC_ENABLE_SETTING) == false) {
             throw new IllegalArgumentException("transport-grpc is experimental and feature flag must be enabled before use");
         }
-        final List<BindableService> services = List.of(new MainActionService(client));
-        this.transport = new Netty4GrpcServerTransport(clusterService.getSettings(), services);
+        this.transport = new Netty4GrpcServerTransport(clusterService.getSettings(), Collections.emptyList());
 
         // The server will manage the lifecycle of any instance of LifecycleComponent that is returned here
         return List.of(transport);