executorService.shutdownNow();
            }
        }
    }

    /**
     * Performs a search operation using rank fusion across available searchers.
     * If only one searcher is available, uses the main searcher. Otherwise, performs
     * concurrent searches across multiple searchers and fuses the results.
     *
     * @param query the search query string

            return null;
        }
        return configId.substring(1);
    }

    /**
     * Retrieves a crawling configuration by its config ID.
     * This method uses caching to improve performance and automatically determines
     * the configuration type and delegates to the appropriate service.
     *
     * @param configId the configuration ID to retrieve

 * </p>
 *
 * <p>
 * The {@link ContentWriter} functional interface is used to abstract the process of writing content to a writer.
 * </p>
 *
 * <p>
 * The class uses temporary files for processing large input streams and ensures that these files are deleted after
 * processing.
 * </p>
 *
 */
public class TikaExtractor extends PasswordBasedExtractor {

curl -X PUT "http://localhost:8080/api/admin/documents/bulk" \
  -H "Content-Type: application/x-ndjson" \
  -u admin:admin \
  --data-binary @fess-documents.json
```

#### Index Settings Migration

Fess uses OpenSearch/Elasticsearch internally, so you can:

1. Export index mappings and settings from source
2. Apply custom analyzers in Fess's `fess_config.properties`
3. Create synonym dictionaries in Fess's dictionary directory

            }
        }
        return documentItems;
    }

    /**
     * Performs a scroll search for processing large result sets efficiently.
     *
     * This method uses OpenSearch scroll API to iterate through large numbers of
     * documents without loading them all into memory at once.
     *
     * @param params The search request parameters

 * and can handle GZIP compressed sitemaps.
 * The class provides methods to check if an input stream is a valid sitemap,
 * and to parse an input stream into a {@link SitemapSet} object.
 * It uses SAX parser for XML sitemaps and XML sitemap indexes,
 * and handles potential exceptions during parsing.
 * The class also includes inner classes for handling XML sitemap and sitemap index parsing.
 */

     */
    boolean isAllowNTLMFallback();

    /**
     * Property {@code jcifs.smb.useRawNTLM} (boolean, default false)
     *
     * @return whether to use raw NTLMSSP tokens instead of SPNEGO wrapped ones
     * @since 2.1
     */
    boolean isUseRawNTLM();

    /**
     *
     * Property {@code jcifs.smb.client.disablePlainTextPasswords} (boolean, default true)
     *

            final SmbTransportInternal trans = dc.unwrap(SmbTransportInternal.class);
            // the tconHostName is from the DC referral, that referral must be resolved
            // before following deeper ones. Otherwise e.g. samba will return a broken
            // referral.
            synchronized (trans) {
                try {
                    // ensure connected
                    trans.ensureConnected();

        if (StringUtil.isNotBlank(msg)) {
            errors.offer(msg);
        }
    }

    /**
     * Command-line options container for the crawler application.
     * This class uses args4j annotations to define command-line arguments
     * and provides methods to parse and access configuration values.
     */
    public static class Options {

 * passive/active modes, and encoding settings. It also handles FTP file attributes such as user,
 * group, and symbolic links.
 *
 * <p>
 * The class uses Apache Commons Net library for FTP communication. It maintains a queue of FTPClient
 * instances to improve performance by reusing connections.
 * </p>
 *
 * <p>