Fix merge issue between #43410 and #43449

PR builds on #43410 had not picked up the change merged in #43449

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/XPackInfoFeatureAction.java

@@ -34,9 +34,11 @@ public class XPackInfoFeatureAction extends Action<XPackInfoFeatureResponse> {
     public static final XPackInfoFeatureAction CCR = new XPackInfoFeatureAction(XPackField.CCR);
     public static final XPackInfoFeatureAction DATA_FRAME = new XPackInfoFeatureAction(XPackField.DATA_FRAME);
     public static final XPackInfoFeatureAction VECTORS = new XPackInfoFeatureAction(XPackField.VECTORS);
+    public static final XPackInfoFeatureAction VOTING_ONLY = new XPackInfoFeatureAction(XPackField.VOTING_ONLY);
 
     public static final List<XPackInfoFeatureAction> ALL = Arrays.asList(
-        SECURITY, MONITORING, WATCHER, GRAPH, MACHINE_LEARNING, LOGSTASH, SQL, ROLLUP, INDEX_LIFECYCLE, CCR, DATA_FRAME, VECTORS
+        SECURITY, MONITORING, WATCHER, GRAPH, MACHINE_LEARNING, LOGSTASH, SQL, ROLLUP, INDEX_LIFECYCLE, CCR, DATA_FRAME, VECTORS,
+        VOTING_ONLY
     );
 
     private XPackInfoFeatureAction(String name) {

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/action/XPackUsageFeatureAction.java

@@ -34,11 +34,11 @@ public class XPackUsageFeatureAction extends Action<XPackUsageFeatureResponse> {
     public static final XPackUsageFeatureAction CCR = new XPackUsageFeatureAction(XPackField.CCR);
     public static final XPackUsageFeatureAction DATA_FRAME = new XPackUsageFeatureAction(XPackField.DATA_FRAME);
     public static final XPackUsageFeatureAction VECTORS = new XPackUsageFeatureAction(XPackField.VECTORS);
-    public static final XPackUsageFeatureAction VOTING_ONLY_NODE = new XPackUsageFeatureAction(XPackField.VOTING_ONLY);
+    public static final XPackUsageFeatureAction VOTING_ONLY = new XPackUsageFeatureAction(XPackField.VOTING_ONLY);
 
     public static final List<XPackUsageFeatureAction> ALL = Arrays.asList(
         SECURITY, MONITORING, WATCHER, GRAPH, MACHINE_LEARNING, LOGSTASH, SQL, ROLLUP, INDEX_LIFECYCLE, CCR, DATA_FRAME, VECTORS,
-        VOTING_ONLY_NODE
+        VOTING_ONLY
     );
 
     private XPackUsageFeatureAction(String name) {

x-pack/plugin/voting-only-node/src/main/java/org/elasticsearch/cluster/coordination/VotingOnlyNodeFeatureSet.java

@@ -18,6 +18,8 @@ import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 import org.elasticsearch.xpack.core.XPackFeatureSet;
 import org.elasticsearch.xpack.core.XPackField;
+import org.elasticsearch.xpack.core.action.XPackInfoFeatureAction;
+import org.elasticsearch.xpack.core.action.XPackInfoFeatureTransportAction;
 import org.elasticsearch.xpack.core.action.XPackUsageFeatureAction;
 import org.elasticsearch.xpack.core.action.XPackUsageFeatureResponse;
 import org.elasticsearch.xpack.core.action.XPackUsageFeatureTransportAction;
@@ -55,7 +57,7 @@ public class VotingOnlyNodeFeatureSet implements XPackFeatureSet {
         public UsageTransportAction(TransportService transportService, ClusterService clusterService, ThreadPool threadPool,
                                     ActionFilters actionFilters, IndexNameExpressionResolver indexNameExpressionResolver,
                                     XPackLicenseState licenseState) {
-            super(XPackUsageFeatureAction.VOTING_ONLY_NODE.name(), transportService, clusterService,
+            super(XPackUsageFeatureAction.VOTING_ONLY.name(), transportService, clusterService,
                 threadPool, actionFilters, indexNameExpressionResolver);
             this.licenseState = licenseState;
         }
@@ -68,4 +70,31 @@ public class VotingOnlyNodeFeatureSet implements XPackFeatureSet {
             listener.onResponse(new XPackUsageFeatureResponse(usage));
         }
     }
+
+    public static class UsageInfoAction extends XPackInfoFeatureTransportAction {
+
+        private final XPackLicenseState licenseState;
+
+        @Inject
+        public UsageInfoAction(TransportService transportService, ActionFilters actionFilters,
+                               XPackLicenseState licenseState) {
+            super(XPackInfoFeatureAction.VOTING_ONLY.name(), transportService, actionFilters);
+            this.licenseState = licenseState;
+        }
+
+        @Override
+        protected String name() {
+            return XPackField.VOTING_ONLY;
+        }
+
+        @Override
+        protected boolean available() {
+            return licenseState.isVotingOnlyAllowed();
+        }
+
+        @Override
+        protected boolean enabled() {
+            return true;
+        }
+    }
 }

x-pack/plugin/voting-only-node/src/main/java/org/elasticsearch/cluster/coordination/VotingOnlyNodePlugin.java

@@ -42,10 +42,12 @@ import org.elasticsearch.transport.TransportResponse;
 import org.elasticsearch.transport.TransportResponseHandler;
 import org.elasticsearch.watcher.ResourceWatcherService;
 import org.elasticsearch.xpack.core.XPackPlugin;
+import org.elasticsearch.xpack.core.action.XPackInfoFeatureAction;
 import org.elasticsearch.xpack.core.action.XPackUsageFeatureAction;
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
@@ -53,8 +55,6 @@ import java.util.Map;
 import java.util.Set;
 import java.util.function.Supplier;
 
-import static java.util.Collections.singletonList;
-
 public class VotingOnlyNodePlugin extends Plugin implements DiscoveryPlugin, NetworkPlugin, ActionPlugin {
 
     public static final Setting<Boolean> VOTING_ONLY_NODE_SETTING
@@ -112,7 +112,8 @@ public class VotingOnlyNodePlugin extends Plugin implements DiscoveryPlugin, Net
 
     @Override
     public List<ActionHandler<? extends ActionRequest, ? extends ActionResponse>> getActions() {
-        return singletonList(new ActionHandler<>(XPackUsageFeatureAction.VOTING_ONLY_NODE, UsageTransportAction.class));
+        return Arrays.asList(new ActionHandler<>(XPackUsageFeatureAction.VOTING_ONLY, UsageTransportAction.class),
+            new ActionHandler<>(XPackInfoFeatureAction.VOTING_ONLY, VotingOnlyNodeFeatureSet.UsageInfoAction.class));
     }
 
     @Override