**Build scan:**
https://gradle-enterprise.elastic.co/s/dxnvahurwubcu/tests/:server:internalClusterTest/org.elasticsearch.action.admin.indices.create.CreateIndexIT/testCreateAndDeleteIndexConcurrently

**Reproduction line:**
```
./gradlew ':server:internalClusterTest' --tests "org.elasticsearch.action.admin.indices.create.CreateIndexIT.testCreateAndDeleteIndexConcurrently" -Dtests.seed=3ED3285ADA7A0152 -Dtests.locale=is -Dtests.timezone=Africa/Tunis -Druntime.java=20
```

**Applicable branches:**
main, 8.8

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.action.admin.indices.create.CreateIndexIT&tests.test=testCreateAndDeleteIndexConcurrently

**Failure excerpt:**
```
java.lang.Exception: Test abandoned because suite timeout was reached.

  at __randomizedtesting.SeedInfo.seed([3ED3285ADA7A0152]:0)

```
server/src/main/java/org/elasticsearch/indices/recovery/RecoverySourceHandler.java
}
        synchronized List<StoreFileMetadata> getFilesFailedToRecoverFromSnapshot() {
            return Objects.requireNonNullElse(filesFailedToDownloadFromSnapshot, Collections.emptyList());
        }
        private void trackOutstandingRequest(SubscribableListener<Void> future) {
            boolean cancelled;
            synchronized (outstandingRequests) {
                cancelled = cancellableThreads.isCancelled() || this.cancelled.get();
                if (cancelled == false) {
                    outstandingRequests.add(future);
                }
            }
            if (cancelled) {
                cancellableThreads.checkForCancel();
                
                
                
                
                
                assert this.cancelled.get();
                throw new CancellableThreads.ExecutionCancelledException("Recover snapshot files cancelled");
            }
        }
        private void unTrackOutstandingRequest(SubscribableListener<Void> future) {
            synchronized (outstandingRequests) {
                outstandingRequests.remove(future);
            }
        }
        private void notifyFailureOnceAllOutstandingRequestAreDone(Exception e) {
            assert cancelled.get();