A user (on 7.17.7) reported to me a situation where they were attempting to delete a snapshot and would get the log message `deleting snapshots [snapshot-test] from repository [my-snapshots]` but then no further messages at `INFO` or above; enabling some internal logging indicated some low-level timeouts:

```
[DEBUG][com.amazonaws.latency    ] [instance-0123456789] MaxRetriesExceeded=[true], ServiceName=[Amazon S3], ServiceEndpoint=[https://REDACTED/], Exception=[java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out, java.net.SocketTimeoutException: Read timed out],...
```

This was enough for the user to go and investigate some performance issues in their repository, but I find the lack of logging concerning. Eventually the cluster state contains no ongoing snapshot deletion, but there is nothing in the logs to indicate that anything didn't work. The deletion API request had already timed out by this point so we can't return an error that way either. I'm opening this issue to make sure we investigate the missing logging.
server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
snapshotListeners.onResponse(endAndGetListenersToResolve(snapshot));
                            runNextQueuedOperation(updatedRepositoryData, repository, true);
                        }, e -> handleFinalizationFailure(e, snapshot, repositoryData)),
                        snInfo -> snapshotListeners.addListener(new ActionListener<>() {
                            @Override
                            public void onResponse(List<ActionListener<SnapshotInfo>> actionListeners) {
                                completeListenersIgnoringException(actionListeners, snInfo);
                                logger.info("snapshot [{}] completed with state [{}]", snapshot, snInfo.state());
                            }
                            @Override
                            public void onFailure(Exception e) {
                                
                                assert false : e;
                            }
                        })
                    )
                );
            }, e -> handleFinalizationFailure(e, snapshot, repositoryData)));
        } catch (Exception e) {
            assert false : new AssertionError(e);
            handleFinalizationFailure(e, snapshot, repositoryData);
        }
    }
    /**
     * Removes all feature states which have missing or failed shards, as they are no longer safely restorable.
     * @param entry The "in progress" entry with a list of feature states and one or more failed shards.
     * @param finalIndices The final list of indices in the snapshot, after any indices that were concurrently deleted are removed.