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    private static final String WEB_FS_CRAWLING_PROCESS = "WebFsCrawler";

    /** Thread name for data store crawling process. */
    private static final String DATA_CRAWLING_PROCESS = "DataStoreCrawler";

    /** Atomic flag indicating whether the crawler is currently running. */
    private static AtomicBoolean running = new AtomicBoolean(false);

    /** Thread-safe queue for collecting error messages during crawling operations. */

      except as required for reasonable and customary use in describing the
      origin of the Work and reproducing the content of the NOTICE file.

   7. Disclaimer of Warranty. Unless required by applicable law or
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      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or