### Elasticsearch Version

8.6.0-SNAPSHOT

### Installed Plugins

_No response_

### Java Version

_bundled_

### OS Version

N/A

### Problem Description

We see 8.6.0 master nodes (512MB heap) repeatedly dying with OOME when attempting to do a snapshot with GCS snapshot repository. This is not reproducible with prior versions and we suspect that this is caused by https://github.com/elastic/elasticsearch/pull/90282.

### Steps to Reproduce

1. Start a cluster in a containerized environment; master nodes have 1GB of memory, 512MB of heap
2. Setup a GCS snapshot repository
3. Create a snapshot of the cluster.
4. The master node will OOM with the following message:

```
[5383.050s][warning][gc,alloc] elasticsearch[i6][snapshot][T#26]: Retried waiting for GCLocker too often allocating 256 words
[5383.053s][warning][gc,alloc] elasticsearch[i6][snapshot][T#14]: Retried waiting for GCLocker too often allocating 1029 words
java.lang.OutOfMemoryError: Java heap space
```

### Logs (if relevant)

_No response_
server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
public static boolean terminate(ThreadPool pool, long timeout, TimeUnit timeUnit) {
        if (pool != null) {
            
            pool.shutdown();
            if (awaitTermination(pool, timeout, timeUnit)) {
                return true;
            }
            
            pool.shutdownNow();
            return awaitTermination(pool, timeout, timeUnit);
        }
        return false;
    }
    private static boolean awaitTermination(final ThreadPool threadPool, final long timeout, final TimeUnit timeUnit) {
        try {
            if (threadPool.awaitTermination(timeout, timeUnit)) {
                return true;
            }
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        }
        return false;
    }
    public ThreadContext getThreadContext() {
        return threadContext;
    }
    public static boolean assertNotScheduleThread(String reason) {
        assert Thread.currentThread().getName().contains("scheduler") == false
            : "Expected current thread [" + Thread.currentThread() + "] to not be the scheduler thread. Reason: [" + reason + "]";
        return true;