/** Indexing target identifier key. */
    public static final String INDEXING_TARGET = "indexingTarget";

    /** Number of threads configuration key. */
    public static final String NUM_OF_THREADS = "numOfThreads";

    // ============================================================
    // Authentication Type Constants
    // ============================================================

    }

    /**
     * Sets the number of threads to use for thumbnail generation.
     *
     * @param numOfThreads the number of threads
     * @return this job instance for method chaining
     */
    public GenerateThumbnailJob numOfThreads(final int numOfThreads) {
        this.numOfThreads = numOfThreads;
        return this;
    }

    /**
     * Enables cleanup operations for this job.
     *

        protected String propertiesPath;

        /**
         * Number of threads to use for thumbnail generation.
         */
        @Option(name = "-t", aliases = "--numOfThreads", metaVar = "numOfThreads", usage = "The number of threads")
        protected int numOfThreads = 1;

        /**
         * Whether to run in cleanup mode to remove old thumbnails.
         */