### 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
)
        );
        builders.put(
            Names.FETCH_SHARD_STARTED,
            new ScalingExecutorBuilder(Names.FETCH_SHARD_STARTED, 1, 2 * allocatedProcessors, TimeValue.timeValueMinutes(5), false)
        );
        builders.put(
            Names.FORCE_MERGE,
            new FixedExecutorBuilder(settings, Names.FORCE_MERGE, oneEighthAllocatedProcessors(allocatedProcessors), -1, false)
        );
        builders.put(Names.CLUSTER_COORDINATION, new FixedExecutorBuilder(settings, Names.CLUSTER_COORDINATION, 1, -1, false));
        builders.put(
            Names.FETCH_SHARD_STORE,
            new ScalingExecutorBuilder(Names.FETCH_SHARD_STORE, 1, 2 * allocatedProcessors, TimeValue.timeValueMinutes(5), false)
        );
        builders.put(Names.SYSTEM_READ, new FixedExecutorBuilder(settings, Names.SYSTEM_READ, halfProcMaxAt5, 2000, false));
        builders.put(Names.SYSTEM_WRITE, new FixedExecutorBuilder(settings, Names.SYSTEM_WRITE, halfProcMaxAt5, 1000, false));
        builders.put(
            Names.SYSTEM_CRITICAL_READ,
            new FixedExecutorBuilder(settings, Names.SYSTEM_CRITICAL_READ, halfProcMaxAt5, 2000, false)
        );
        builders.put(
            Names.SYSTEM_CRITICAL_WRITE,
            new FixedExecutorBuilder(settings, Names.SYSTEM_CRITICAL_WRITE, halfProcMaxAt5, 1500, false)
        );
        for (final ExecutorBuilder<?> builder : customBuilders) {
            if (builders.containsKey(builder.name())) {
                throw new IllegalArgumentException("builder with name [" + builder.name() + "] already exists");
            }
            builders.put(builder.name(), builder);