Today we log a "deleting snapshots [...] from repository [...]" message at INFO level [almost the first thing](https://github.com/elastic/elasticsearch/blob/dfaec0dbf0c8a0ba2912381334019725848f1f5a/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java#L1886-L1888) when we start the deletion. However, the requested snapshots may not exist or they may be wildcards to be matched against actual snapshots. In these cases, the log message is either misleading or insuffiicent. Instead we should log the message after we have successfully added the delete to the cluster state similar to how the [logging works for snapshot creation](https://github.com/elastic/elasticsearch/blob/f77c16b78bab5e9f3ee24974aeba408e254e8c94/server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java#L3804).
server/src/main/java/org/elasticsearch/snapshots/SnapshotsService.java
validate(repositoryName, snapshotName, currentState);
            final SnapshotDeletionsInProgress deletionsInProgress = SnapshotDeletionsInProgress.get(currentState);
            ensureNoCleanupInProgress(currentState, repositoryName, snapshotName, "create snapshot");
            ensureBelowConcurrencyLimit(repositoryName, snapshotName, snapshotsInProgress, deletionsInProgress);
            final CreateSnapshotRequest request = createSnapshotTask.createSnapshotRequest;
            
            Map<Boolean, List<String>> requestedIndices = Arrays.stream(
                indexNameExpressionResolver.concreteIndexNames(currentState, request)
            ).collect(Collectors.partitioningBy(systemIndices::isSystemIndex));
            List<String> requestedSystemIndices = requestedIndices.get(true);
            if (requestedSystemIndices.isEmpty() == false) {
                Set<String> explicitlyRequestedSystemIndices = new HashSet<>(requestedSystemIndices);
                explicitlyRequestedSystemIndices.retainAll(Arrays.asList(request.indices()));
                if (explicitlyRequestedSystemIndices.isEmpty() == false) {
                    throw new IllegalArgumentException(
                        format(
                            "the [indices] parameter includes system indices %s; to include or exclude system indices from a "
                                + "snapshot, use the [include_global_state] or [feature_states] parameters",
                            explicitlyRequestedSystemIndices
                        )
                    );
                }
            }
            List<String> indices = requestedIndices.get(false);
            
            
            
            final List<String> requestedStates = Arrays.asList(request.featureStates());
            final Set<String> featureStatesSet;
            if (request.includeGlobalState() || requestedStates.isEmpty() == false) {