Interim build fix for PluginSubject related changes (#4690)

Signed-off-by: Craig Perkins <cwperx@amazon.com>
(cherry picked from commit a1c0c7b)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

src/main/java/org/opensearch/security/OpenSearchSecurityPlugin.java

@@ -107,6 +107,7 @@
 import org.opensearch.http.HttpServerTransport;
 import org.opensearch.http.HttpServerTransport.Dispatcher;
 import org.opensearch.http.netty4.ssl.SecureNetty4HttpServerTransport;
+import org.opensearch.identity.PluginSubject;
 import org.opensearch.identity.Subject;
 import org.opensearch.identity.noop.NoopSubject;
 import org.opensearch.index.IndexModule;
@@ -117,6 +118,7 @@
 import org.opensearch.plugins.ExtensionAwarePlugin;
 import org.opensearch.plugins.IdentityPlugin;
 import org.opensearch.plugins.MapperPlugin;
+import org.opensearch.plugins.Plugin;
 import org.opensearch.plugins.SecureHttpTransportSettingsProvider;
 import org.opensearch.plugins.SecureSettingsFactory;
 import org.opensearch.plugins.SecureTransportSettingsProvider;
@@ -162,6 +164,7 @@
 import org.opensearch.security.hasher.PasswordHasherFactory;
 import org.opensearch.security.http.NonSslHttpServerTransport;
 import org.opensearch.security.http.XFFResolver;
+import org.opensearch.security.identity.NoopPluginSubject;
 import org.opensearch.security.identity.SecurityTokenManager;
 import org.opensearch.security.privileges.PrivilegesEvaluator;
 import org.opensearch.security.privileges.PrivilegesInterceptor;
@@ -2100,7 +2103,7 @@ private static String handleKeyword(final String field) {
     }
 
     @Override
-    public Subject getSubject() {
+    public Subject getCurrentSubject() {
         // Not supported
         return new NoopSubject();
     }
@@ -2110,6 +2113,11 @@ public SecurityTokenManager getTokenManager() {
         return tokenManager;
     }
 
+    @Override
+    public PluginSubject getPluginSubject(Plugin plugin) {
+        return new NoopPluginSubject(threadPool);
+    }
+
     @Override
     public Optional<SecureSettingsFactory> getSecureSettingFactory(Settings settings) {
         return Optional.of(new OpenSearchSecureSettingsFactory(threadPool, sks, sslExceptionHandler, securityRestHandler));

src/main/java/org/opensearch/security/identity/NoopPluginSubject.java

@@ -0,0 +1,41 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * The OpenSearch Contributors require contributions made to
+ * this file be licensed under the Apache-2.0 license or a
+ * compatible open source license.
+ *
+ * Modifications Copyright OpenSearch Contributors. See
+ * GitHub history for details.
+ */
+
+package org.opensearch.security.identity;
+
+import java.security.Principal;
+import java.util.concurrent.Callable;
+
+import org.opensearch.common.util.concurrent.ThreadContext;
+import org.opensearch.identity.NamedPrincipal;
+import org.opensearch.identity.PluginSubject;
+import org.opensearch.threadpool.ThreadPool;
+
+public class NoopPluginSubject implements PluginSubject {
+    private final ThreadPool threadPool;
+
+    public NoopPluginSubject(ThreadPool threadPool) {
+        super();
+        this.threadPool = threadPool;
+    }
+
+    @Override
+    public Principal getPrincipal() {
+        return NamedPrincipal.UNAUTHENTICATED;
+    }
+
+    @Override
+    public <T> T runAs(Callable<T> callable) throws Exception {
+        try (ThreadContext.StoredContext ctx = threadPool.getThreadContext().stashContext()) {
+            return callable.call();
+        }
+    }
+}