more tests

core/src/main/java/org/elasticsearch/common/settings/AbstractScopedSettings.java

@@ -43,7 +43,7 @@ public abstract class AbstractScopedSettings extends AbstractComponent {
             if (entry.getScope() != scope) {
                 throw new IllegalArgumentException("Setting must be a cluster setting but was: " + entry.getScope());
             }
-            if (entry.isGroupSetting()) {
+            if (entry.hasComplexMatcher()) {
                 complexMatchers.put(entry.getKey(), entry);
             } else {
                 keySettings.put(entry.getKey(), entry);

core/src/main/java/org/elasticsearch/common/settings/Setting.java

@@ -92,7 +92,7 @@ public class Setting<T> extends ToXContentToBytes {
      * rather than a single value. The key, see {@link #getKey()}, in contrast to non-group settings is a prefix like <tt>cluster.store.</tt>
      * that matches all settings with this prefix.
      */
-    public boolean isGroupSetting() {
+    boolean isGroupSetting() {
         return false;
     }
 

core/src/test/java/org/elasticsearch/cluster/settings/ClusterSettingsIT.java

@@ -235,6 +235,16 @@ public class ClusterSettingsIT extends ESIntegTestCase {
         assertThat(response3.getPersistentSettings().get(key2), notNullValue());
     }
 
+    public void testCanUpdateTracerSettings() {
+        ClusterUpdateSettingsResponse clusterUpdateSettingsResponse = client().admin().cluster()
+            .prepareUpdateSettings()
+            .setTransientSettings(Settings.builder().putArray("transport.tracer.include", "internal:index/shard/recovery/*",
+                "internal:gateway/local*"))
+            .get();
+        assertArrayEquals(clusterUpdateSettingsResponse.getTransientSettings().getAsArray("transport.tracer.include"), new String[] {"internal:index/shard/recovery/*",
+            "internal:gateway/local*"});
+    }
+
     public void testUpdateDiscoveryPublishTimeout() {
 
         DiscoverySettings discoverySettings = internalCluster().getInstance(DiscoverySettings.class);

core/src/test/java/org/elasticsearch/common/settings/ScopedSettingsTests.java

@@ -151,5 +151,7 @@ public class ScopedSettingsTests extends ESTestCase {
         assertEquals(ref.get().size(), 2);
         assertTrue(ref.get().contains("internal:index/shard/recovery/*"));
         assertTrue(ref.get().contains("internal:gateway/local*"));
+        assertNotNull(settings.get("transport.tracer.include." + randomIntBetween(1, 100)));
+        assertSame(TransportService.TRACE_LOG_INCLUDE_SETTING, settings.get("transport.tracer.include." + randomIntBetween(1, 100)));
     }
 }