Import replicated closed dangling indices (#50649)

Dangling replicated closed indices are not imported properly (they miss their routing table when imported).

Author: ywelsch

server/src/main/java/org/elasticsearch/cluster/routing/RoutingTable.java

@@ -510,7 +510,7 @@ public Builder addAsRecovery(IndexMetaData indexMetaData) {
         }
 
         public Builder addAsFromDangling(IndexMetaData indexMetaData) {
-            if (indexMetaData.getState() == IndexMetaData.State.OPEN) {
+            if (indexMetaData.getState() == IndexMetaData.State.OPEN || isIndexVerifiedBeforeClosed(indexMetaData)) {
                 IndexRoutingTable.Builder indexRoutingBuilder = new IndexRoutingTable.Builder(indexMetaData.getIndex())
                         .initializeAsFromDangling(indexMetaData);
                 add(indexRoutingBuilder);

server/src/main/java/org/elasticsearch/gateway/LocalAllocateDangledIndices.java

@@ -51,6 +51,8 @@
 import java.util.Arrays;
 import java.util.Collection;
 
+import static org.elasticsearch.cluster.metadata.MetaDataIndexStateService.isIndexVerifiedBeforeClosed;
+
 public class LocalAllocateDangledIndices {
 
     private static final Logger logger = LogManager.getLogger(LocalAllocateDangledIndices.class);
@@ -149,7 +151,7 @@ public ClusterState execute(ClusterState currentState) {
                         }
                         metaData.put(upgradedIndexMetaData, false);
                         blocks.addBlocks(upgradedIndexMetaData);
-                        if (upgradedIndexMetaData.getState() == IndexMetaData.State.OPEN) {
+                        if (upgradedIndexMetaData.getState() == IndexMetaData.State.OPEN || isIndexVerifiedBeforeClosed(indexMetaData)) {
                             routingTableBuilder.addAsFromDangling(upgradedIndexMetaData);
                         }
                         sb.append("[").append(upgradedIndexMetaData.getIndex()).append("/").append(upgradedIndexMetaData.getState())

server/src/test/java/org/elasticsearch/indices/recovery/DanglingIndicesIT.java

@@ -53,6 +53,11 @@ public void testDanglingIndicesAreRecoveredWhenSettingIsEnabled() throws Excepti
 
         createIndex(INDEX_NAME, Settings.builder().put("number_of_replicas", 2).build());
 
+        if (randomBoolean()) {
+            client().admin().indices().prepareClose(INDEX_NAME).get();
+        }
+        ensureGreen(INDEX_NAME);
+
         // Restart node, deleting the index in its absence, so that there is a dangling index to recover
         internalCluster().restartRandomDataNode(new InternalTestCluster.RestartCallback() {
 
@@ -64,6 +69,7 @@ public Settings onNodeStopped(String nodeName) throws Exception {
         });
 
         assertBusy(() -> assertTrue("Expected dangling index " + INDEX_NAME + " to be recovered", indexExists(INDEX_NAME)));
+        ensureGreen(INDEX_NAME);
     }
 
     /**