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diff --git a/core/src/test/java/org/elasticsearch/cluster/metadata/MetaDataIndexUpgradeServiceTests.java b/core/src/test/java/org/elasticsearch/cluster/metadata/MetaDataIndexUpgradeServiceTests.java
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+++ b/core/src/test/java/org/elasticsearch/cluster/metadata/MetaDataIndexUpgradeServiceTests.java
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+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.cluster.metadata;
+
+import org.elasticsearch.Version;
+import org.elasticsearch.common.settings.IndexScopedSettings;
+import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.indices.mapper.MapperRegistry;
+import org.elasticsearch.test.ESTestCase;
+import org.elasticsearch.test.VersionUtils;
+
+import java.util.Collections;
+
+public class MetaDataIndexUpgradeServiceTests extends ESTestCase {
+
+    public void testArchiveBrokenIndexSettings() {
+        MetaDataIndexUpgradeService service = new MetaDataIndexUpgradeService(Settings.EMPTY, new MapperRegistry(Collections.emptyMap(), Collections.emptyMap()), IndexScopedSettings.DEFAULT_SCOPED_SETTINGS);
+        IndexMetaData src = newIndexMeta("foo", Settings.EMPTY);
+        IndexMetaData indexMetaData = service.archiveBrokenIndexSettings(src);
+        assertSame(indexMetaData, src);
+
+        src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
+        indexMetaData = service.archiveBrokenIndexSettings(src);
+        assertNotSame(indexMetaData, src);
+        assertEquals("-200", indexMetaData.getSettings().get("archived.index.refresh_interval"));
+
+        src = newIndexMeta("foo", Settings.builder().put("index.codec", "best_compression1").build());
+        indexMetaData = service.archiveBrokenIndexSettings(src);
+        assertNotSame(indexMetaData, src);
+        assertEquals("best_compression1", indexMetaData.getSettings().get("archived.index.codec"));
+
+        src = newIndexMeta("foo", Settings.builder().put("index.refresh.interval", "-1").build());
+        indexMetaData = service.archiveBrokenIndexSettings(src);
+        assertNotSame(indexMetaData, src);
+        assertEquals("-1", indexMetaData.getSettings().get("archived.index.refresh.interval"));
+
+        src = newIndexMeta("foo", indexMetaData.getSettings()); // double archive?
+        indexMetaData = service.archiveBrokenIndexSettings(src);
+        assertSame(indexMetaData, src);
+    }
+
+    public void testUpgrade() {
+        MetaDataIndexUpgradeService service = new MetaDataIndexUpgradeService(Settings.EMPTY, new MapperRegistry(Collections.emptyMap(), Collections.emptyMap()), IndexScopedSettings.DEFAULT_SCOPED_SETTINGS);
+        IndexMetaData src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
+        assertFalse(service.isUpgraded(src));
+        src = service.upgradeIndexMetaData(src);
+        assertTrue(service.isUpgraded(src));
+        assertEquals("-200", src.getSettings().get("archived.index.refresh_interval"));
+        assertNull(src.getSettings().get("index.refresh_interval"));
+        assertSame(src, service.upgradeIndexMetaData(src)); // no double upgrade
+    }
+
+    public void testIsUpgraded() {
+        MetaDataIndexUpgradeService service = new MetaDataIndexUpgradeService(Settings.EMPTY, new MapperRegistry(Collections.emptyMap(), Collections.emptyMap()), IndexScopedSettings.DEFAULT_SCOPED_SETTINGS);
+        IndexMetaData src = newIndexMeta("foo", Settings.builder().put("index.refresh_interval", "-200").build());
+        assertFalse(service.isUpgraded(src));
+        Version version = VersionUtils.randomVersionBetween(random(), VersionUtils.getFirstVersion(), VersionUtils.getPreviousVersion());
+        src = newIndexMeta("foo", Settings.builder().put(IndexMetaData.SETTING_VERSION_UPGRADED, version).build());
+        assertFalse(service.isUpgraded(src));
+        src = newIndexMeta("foo", Settings.builder().put(IndexMetaData.SETTING_VERSION_UPGRADED, Version.CURRENT).build());
+        assertTrue(service.isUpgraded(src));
+    }
+
+    public static IndexMetaData newIndexMeta(String name, Settings indexSettings) {
+        Settings build = Settings.settingsBuilder().put(IndexMetaData.SETTING_VERSION_CREATED, Version.CURRENT)
+            .put(IndexMetaData.SETTING_NUMBER_OF_REPLICAS, 1)
+            .put(IndexMetaData.SETTING_NUMBER_OF_SHARDS, 1)
+            .put(IndexMetaData.SETTING_CREATION_DATE, 1)
+            .put(IndexMetaData.SETTING_INDEX_UUID, "BOOM")
+            .put(IndexMetaData.SETTING_VERSION_UPGRADED, Version.V_0_18_1_ID)
+            .put(indexSettings)
+            .build();
+        IndexMetaData metaData = IndexMetaData.builder(name).settings(build).build();
+        return metaData;
+    }
+
+}