### 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(() -> {
            
            try (Engine.Searcher searcher = shard.acquireSearcher("test")) {
                TopDocs search = searcher.search(new MatchAllDocsQuery(), 10);
                assertEquals(2, search.totalHits.value);
            }
        });
        client().prepareIndex("test").setId("2").setSource("{\"foo\": \"bar\"}", XContentType.JSON).get();
        assertBusy(() -> {
            
            try (Engine.Searcher searcher = shard.acquireSearcher("test")) {
                TopDocs search = searcher.search(new MatchAllDocsQuery(), 10);
                assertEquals(3, search.totalHits.value);
            }
        });
    }
    public void testAsyncFsyncActuallyWorks() throws Exception {
        Settings settings = Settings.builder()
            .put(IndexSettings.INDEX_TRANSLOG_SYNC_INTERVAL_SETTING.getKey(), "100ms") 
            .put(IndexSettings.INDEX_TRANSLOG_DURABILITY_SETTING.getKey(), Translog.Durability.ASYNC)
            .build();
        IndexService indexService = createIndex("test", settings);
        ensureGreen("test");
        assertTrue(indexService.getRefreshTask().mustReschedule());
        client().prepareIndex("test").setId("1").setSource("{\"foo\": \"bar\"}", XContentType.JSON).get();
        IndexShard shard = indexService.getShard(0);
        assertBusy(() -> assertFalse(shard.isSyncNeeded()));
    }
    public void testRescheduleAsyncFsync() throws Exception {
        final Settings settings = Settings.builder()