TEST: Enable debug log testValidateFollowingIndexSettings

Author: dnhatn

x-pack/plugin/ccr/src/test/java/org/elasticsearch/xpack/ccr/ShardChangesIT.java

@@ -36,6 +36,7 @@
 import org.elasticsearch.tasks.TaskInfo;
 import org.elasticsearch.test.ESIntegTestCase;
 import org.elasticsearch.test.discovery.TestZenDiscovery;
+import org.elasticsearch.test.junit.annotations.TestLogging;
 import org.elasticsearch.xpack.ccr.action.CreateAndFollowIndexAction;
 import org.elasticsearch.xpack.ccr.action.FollowIndexAction;
 import org.elasticsearch.xpack.ccr.action.ShardChangesAction;
@@ -430,6 +431,7 @@ public void testFollowNonExistentIndex() throws Exception {
         expectThrows(IllegalArgumentException.class, () -> client().execute(FollowIndexAction.INSTANCE, followRequest3).actionGet());
     }
 
+    @TestLogging("_root:DEBUG")
     public void testValidateFollowingIndexSettings() throws Exception {
         assertAcked(client().admin().indices().prepareCreate("test-leader")
             .setSettings(Settings.builder().put(IndexSettings.INDEX_SOFT_DELETES_SETTING.getKey(), true)));