[TEST] Fix settings keys to be the actual keys rather than the toString() of the Setting

core/src/test/java/org/elasticsearch/index/engine/InternalEngineTests.java

@@ -126,7 +126,6 @@ import java.util.concurrent.CyclicBarrier;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
-import java.util.function.IntFunction;
 
 import static java.util.Collections.emptyMap;
 import static org.elasticsearch.index.engine.Engine.Operation.Origin.PRIMARY;
@@ -172,10 +171,10 @@ public class InternalEngineTests extends ESTestCase {
             codecName = "default";
         }
         defaultSettings = IndexSettingsModule.newIndexSettings("test", Settings.builder()
-                .put(IndexSettings.INDEX_GC_DELETES_SETTING, "1h") // make sure this doesn't kick in on us
+                .put(IndexSettings.INDEX_GC_DELETES_SETTING.getKey(), "1h") // make sure this doesn't kick in on us
                 .put(EngineConfig.INDEX_CODEC_SETTING.getKey(), codecName)
                 .put(IndexMetaData.SETTING_VERSION_CREATED, Version.CURRENT)
-                .put(IndexSettings.MAX_REFRESH_LISTENERS_PER_SHARD,
+                .put(IndexSettings.MAX_REFRESH_LISTENERS_PER_SHARD.getKey(),
                         between(10, 10 * IndexSettings.MAX_REFRESH_LISTENERS_PER_SHARD.get(Settings.EMPTY)))
                 .build()); // TODO randomize more settings
         threadPool = new TestThreadPool(getClass().getName());