/** Key for file attribute view in metadata */
    public static final String FILE_ATTRIBUTE_VIEW = "fileAttributeView";

    /** Key for file user in metadata */
    public static final String FS_FILE_USER = "fsFileUser";

    /** Key for file groups in metadata */
    public static final String FS_FILE_GROUPS = "fsFileGroups";

    /** Character encoding for files */

 * <p>
 * This client supports authentication, content retrieval, and metadata extraction from SMB files.
 * It handles file access, directory listing, and access control entries (ACEs) processing.
 * </p>
 *
 * <p>
 * The class provides methods to:
 * </p>
 * <ul>
 *   <li>Initialize the client with SMB authentication details.</li>
 *   <li>Retrieve content and metadata from SMB files.</li>

 * <p>
 * This client supports authentication, content retrieval, and metadata extraction from SMB files.
 * It handles file access, directory listing, and access control entries (ACEs) processing.
 * </p>
 *
 * <p>
 * The class provides methods to:
 * </p>
 * <ul>
 *   <li>Initialize the client with SMB authentication details.</li>
 *   <li>Retrieve content and metadata from SMB files.</li>

    /** Logger instance for this class */
    private static final Logger logger = LogManager.getLogger(FtpClient.class);

    /** Metadata key for FTP file group */
    public static final String FTP_FILE_GROUP = "ftpFileGroup";

    /** Metadata key for FTP file user */
    public static final String FTP_FILE_USER = "ftpFileUser";

    /** Property name for FTP authentications */

import org.opensearch.action.search.SearchResponse;
import org.opensearch.action.support.WriteRequest.RefreshPolicy;
import org.opensearch.action.support.clustermanager.AcknowledgedResponse;
import org.opensearch.cluster.metadata.MappingMetadata;
import org.opensearch.common.unit.TimeValue;
import org.opensearch.common.xcontent.XContentType;
import org.opensearch.core.rest.RestStatus;
import org.opensearch.core.xcontent.XContentBuilder;

        final AccessResultDataImpl accessResultDataImpl = new AccessResultDataImpl();
        accessResultDataImpl.setData(value.getBytes(Constants.UTF_8));
        accessResultDataImpl.setEncoding(Constants.UTF_8);
        accessResultDataImpl.setTransformerName("xmlTransformer");

        final Object obj = xmlTransformer.getData(accessResultDataImpl);
        assertEquals(value, obj);
    }

        final ResultData resultData = fileTransformer.transform(responseData);
        assertEquals("http_CLN_/www.example.com/submit_QUEST_a=1_AMP_b=2", new String(resultData.getData(), "UTF-8"));
        final File file = new File(fileTransformer.baseDir, new String(resultData.getData(), "UTF-8"));
        assertEquals("xyz", new String(FileUtil.readBytes(file)));
    }

    public void test_createFile() throws Exception {

        final AccessResultDataImpl accessResultData = new AccessResultDataImpl();
        accessResultData.setTransformerName("binaryTransformer");
        accessResultData.setData("xyz".getBytes());

        final Object obj = binaryTransformer.getData(accessResultData);
        assertNotNull(obj);
        assertTrue(obj instanceof InputStream);
        assertEquals("xyz", new String(IOUtils.toByteArray((InputStream) obj)));
    }

        try {
            resultData.setData(content.getBytes(charsetName));
        } catch (final UnsupportedEncodingException e) {
            if (logger.isInfoEnabled()) {
                logger.info("Invalid charsetName: " + charsetName + ". Changed to " + Constants.UTF_8, e);
            }
            charsetName = Constants.UTF_8;
            resultData.setData(content.getBytes(Constants.UTF_8_CHARSET));
        }

        final AccessResultDataImpl accessResultDataImpl = new AccessResultDataImpl();
        accessResultDataImpl.setData(value.getBytes(Constants.UTF_8));
        accessResultDataImpl.setEncoding(Constants.UTF_8);
        accessResultDataImpl.setTransformerName("xpathTransformer");

        final Object obj = xpathTransformer.getData(accessResultDataImpl);
        assertEquals(value, obj);
    }