The name of plugin is not reported consistently

src/test/java/org/opensearch/path/to/plugin/RenamePluginIT.java

@@ -10,15 +10,20 @@
 import com.carrotsearch.randomizedtesting.annotations.ThreadLeakScope;
 import org.apache.hc.core5.http.ParseException;
 import org.apache.hc.core5.http.io.entity.EntityUtils;
+import org.opensearch.action.admin.cluster.node.info.NodeInfo;
+import org.opensearch.action.admin.cluster.node.info.NodesInfoResponse;
+import org.opensearch.action.admin.cluster.node.info.PluginsAndModules;
 import org.opensearch.client.Request;
 import org.opensearch.client.Response;
 import org.opensearch.plugins.Plugin;
+import org.opensearch.plugins.PluginInfo;
 import org.opensearch.test.OpenSearchIntegTestCase;
 
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 
 import static org.hamcrest.Matchers.containsString;
 
@@ -38,4 +43,53 @@ public void testPluginInstalled() throws IOException, ParseException {
         logger.info("response body: {}", body);
         assertThat(body, containsString("rename"));
     }
+
+    public void testPluginNames() {
+        NodesInfoResponse response = client().admin().cluster().prepareNodesInfo().clear().addMetric("plugins").get();
+        assertEquals(0, response.failures().size());
+        assertFalse(response.getNodes().isEmpty());
+        List<NodeInfo> nodes = response.getNodes();
+        for (NodeInfo ni : nodes) {
+            assertNotNull(ni.getInfo(PluginsAndModules.class));
+
+            // The following test would fail!
+            /*
+            assertEquals(
+                    1,
+                    ni.getInfo(PluginsAndModules.class).getPluginInfos().stream().filter(
+                            pluginInfo -> pluginInfo.getName().equals("rename")
+                    ).count()
+            );
+            */
+
+            // Normally, I would expect that the plugin deployed into a node will report its name
+            // consistently. But it turns out that in some cases the plugin returns value of its classname
+            // instead of the 'name'.
+            //
+            // Depending on what role the node has, but it seems that there are nodes that have also
+            // two additional plugins deployed: MockNioTransportPlugin and MockHttpTransport$TestPlugin
+            // and in this case the plugins name is a classname (also their description is a "classpath plugin").
+            //
+            // You can setup a breakpoint on the line below and investigate all plugins from particular node.
+
+            List<PluginInfo> pluginInfos = ni.getInfo(PluginsAndModules.class).getPluginInfos();
+            if (pluginInfos.size() > 1) {
+                assertEquals(
+                        1,
+                        ni.getInfo(PluginsAndModules.class).getPluginInfos().stream().filter(
+                                pluginInfo -> pluginInfo.getName().equals("org.opensearch.path.to.plugin.RenamePlugin")
+                        ).count()
+                );
+            } else if (pluginInfos.size() == 1) {
+                assertEquals(
+                        1,
+                        ni.getInfo(PluginsAndModules.class).getPluginInfos().stream().filter(
+                                pluginInfo -> pluginInfo.getName().equals("rename")
+                        ).count()
+                );
+            } else {
+                fail("Unexpected");
+            }
+        }
+    }
 }