Introduce BridgeProjectIdResolver to applying null for project ID.

Author: mashhurs

libs/logstash-bridge/src/main/java/org/elasticsearch/logstashbridge/script/ScriptServiceBridge.java

@@ -8,9 +8,10 @@
  */
 package org.elasticsearch.logstashbridge.script;
 
-import org.elasticsearch.cluster.project.DefaultProjectResolver;
+import org.elasticsearch.cluster.metadata.ProjectId;
 import org.elasticsearch.cluster.project.ProjectResolver;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.core.CheckedRunnable;
 import org.elasticsearch.core.FixForMultiProject;
 import org.elasticsearch.ingest.common.ProcessorsWhitelistExtension;
 import org.elasticsearch.logstashbridge.StableBridgeAPI;
@@ -69,8 +70,8 @@ private static ScriptService getScriptService(final Settings settings, final Lon
             MustacheScriptEngine.NAME,
             new MustacheScriptEngine(settings)
         );
-        @FixForMultiProject // Should this be non-DefaultProjectResolver?
-        final ProjectResolver projectResolver = DefaultProjectResolver.INSTANCE;
+        @FixForMultiProject // Should this be non-BridgeProjectIdResolver?
+        final ProjectResolver projectResolver = new BridgeProjectIdResolver();
         return new ScriptService(settings, scriptEngines, ScriptModule.CORE_CONTEXTS, timeProvider, projectResolver);
     }
 
@@ -113,4 +114,21 @@ public <T> List<T> loadExtensions(Class<T> extensionPointType) {
     public void close() throws IOException {
         this.internalDelegate.close();
     }
+
+    static class BridgeProjectIdResolver implements ProjectResolver {
+
+        @Override
+        public ProjectId getProjectId() {
+            return ProjectId.DEFAULT;
+        }
+
+        @Override
+        public <E extends Exception> void executeOnProject(ProjectId projectId, CheckedRunnable<E> body) throws E {
+            if (projectId.equals(ProjectId.DEFAULT)) {
+                body.run();
+            } else {
+                throw new IllegalArgumentException("Cannot execute on a project other than [" + ProjectId.DEFAULT + "]");
+            }
+        }
+    }
 }