### 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
final CountDownLatch l1 = latch.get();
                final CountDownLatch l2 = latch2.get();
                count.incrementAndGet();
                assertTrue("generic threadpool is configured", Thread.currentThread().getName().contains("[generic]"));
                l1.countDown();
                try {
                    l2.await();
                } catch (InterruptedException e) {
                    fail("interrupted");
                }
                if (randomBoolean()) { 
                    if (randomBoolean()) {
                        throw new RuntimeException("foo");
                    } else {
                        throw new RuntimeException("bar");
                    }
                }
            }
            @Override
            protected String getThreadPool() {
                return ThreadPool.Names.GENERIC;
            }
        };
        latch.get().await();
        latch.set(new CountDownLatch(1));
        assertEquals(1, count.get());
        
        
        latch2.getAndSet(new CountDownLatch(1)).countDown();
        latch.get().await();