presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/metadata/ShardCleanerConfig.java/ShardCleanerConfig/setBackupDeletionThreads
class ShardCleanerConfig:    @Config("raptor.backup-deletion-threads")
    @ConfigDescription("Maximum number of threads to use for deleting shards from backup store")
    public ShardCleanerConfig setBackupDeletionThreads(int backupDeletionThreads)
    {
        this.backupDeletionThreads = backupDeletionThreads;
        return this;
    }