### Elasticsearch Version

8.5.0

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

Linux 9b4c50a443c1 5.15.0-52-generic #58-Ubuntu SMP Thu Oct 13 08:03:55 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux

### Problem Description

In 8.5, _nodes/stats returns a failure message if the node has closed indices. In previous versions, it works.
Please see steps to reproduce.

### Steps to Reproduce

```
$ curl -XPUT http://localhost:9200/test_index
$ curl http://localhost:9200/_nodes/stats  # <- it works
$ curl -XPOST http://localhost:9200/test_index/_close
$ curl http://localhost:9200/_nodes/stats
{
  "_nodes": {
    "total": 1,
    "successful": 0,
    "failed": 1,
    "failures": [
      {
        "type": "failed_node_exception",
        "reason": "Failed node [...]",
        "node_id": "...",
        "caused_by": {
          "type": "null_pointer_exception",
          "reason": "Cannot invoke \"org.elasticsearch.index.mapper.MapperService.mappingLookup()\" because the return value of \"org.elasticsearch.index.IndexService.mapperService()\" is null"
        }
      }
    ]
  },
  "cluster_name": "...",
  "nodes": {}
}
```

### Logs (if relevant)

_No response_
server/src/test/java/org/elasticsearch/index/IndexServiceTests.java
assertBusy(() -> assertTrue("Index not found: " + index.getName(), getInstanceFromNode(IndicesService.class).hasIndex(index)));
        final IndexService closedIndexService = getInstanceFromNode(IndicesService.class).indexServiceSafe(index);
        assertNotSame(indexService, closedIndexService);
        assertNotSame(refreshTask, closedIndexService.getRefreshTask());
        assertFalse(closedIndexService.getRefreshTask().mustReschedule());
        assertFalse(closedIndexService.getRefreshTask().isClosed());
        assertEquals(200, closedIndexService.getRefreshTask().getInterval().millis());
        
        assertAcked(client().admin().indices().prepareOpen(index.getName()));
        assertBusy(() -> assertTrue("Index not found: " + index.getName(), getInstanceFromNode(IndicesService.class).hasIndex(index)));
        indexService = getInstanceFromNode(IndicesService.class).indexServiceSafe(index);
        assertNotSame(closedIndexService, indexService);
        refreshTask = indexService.getRefreshTask();
        assertTrue(indexService.getRefreshTask().mustReschedule());
        assertTrue(refreshTask.isScheduled());
        assertFalse(refreshTask.isClosed());
        indexService.close("simon says", false);
        assertFalse(refreshTask.isScheduled());
        assertTrue(refreshTask.isClosed());
    }
    public void testFsyncTaskIsRunning() throws Exception {
        Settings settings = Settings.builder()
            .put(IndexSettings.INDEX_TRANSLOG_DURABILITY_SETTING.getKey(), Translog.Durability.ASYNC)
            .build();
        IndexService indexService = createIndex("test", settings);
        IndexService.AsyncTranslogFSync fsyncTask = indexService.getFsyncTask();
        assertNotNull(fsyncTask);
        assertEquals(5000, fsyncTask.getInterval().millis());
        assertTrue(fsyncTask.mustReschedule());
        assertTrue(fsyncTask.isScheduled());