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
} else {
                    
                    snapshotChanged = true;
                    logger.warn("failing snapshot of shard [{}] on departed node [{}]", shardId, shardStatus.nodeId());
                    final ShardSnapshotStatus failedState = new ShardSnapshotStatus(
                        shardStatus.nodeId(),
                        ShardState.FAILED,
                        "node left the cluster during snapshot",
                        shardStatus.generation()
                    );
                    shards.put(shardId, failedState);
                    knownFailures.put(shardEntry.getKey(), failedState);
                }
            } else {
                shards.put(shardId, shardStatus);
            }
        }
        if (snapshotChanged) {
            return shards.build();
        } else {
            return null;
        }
    }
    private static boolean waitingShardsStartedOrUnassigned(SnapshotsInProgress snapshotsInProgress, ClusterChangedEvent event) {
        for (List<SnapshotsInProgress.Entry> entries : snapshotsInProgress.entriesByRepo()) {
            for (SnapshotsInProgress.Entry entry : entries) {
                if (entry.state() == State.STARTED && entry.isClone() == false) {
                    for (Map.Entry<RepositoryShardId, ShardSnapshotStatus> shardStatus : entry.shardsByRepoShardId().entrySet()) {
                        final ShardState state = shardStatus.getValue().state();
                        if (state != ShardState.WAITING && state != ShardState.QUEUED) {