@Test
    public void test_multiple_commands_configuration() throws Exception {
        // Test setting multiple commands without triggering execution
        final List<String> commands =
                Arrays.asList("command1 ${url} ${outputFile}", "command2 ${url} ${outputFile}", "command3 ${url} ${outputFile}");

        generator.setCommandList(commands);

    }

    /**
     * Executes an external command with the given parameters.
     * @param commands The command array to execute.
     * @param username The username parameter for the command.
     * @param password The password parameter for the command.
     * @return The exit code of the executed command.
     */
    protected int executeCommand(final String[] commands, final String username, final String password) {

import jakarta.annotation.PostConstruct;

/**
 * Command-based thumbnail generator that executes external commands to create thumbnails.
 * Uses external tools through command execution to generate thumbnail images from documents.
 */
public class CommandGenerator extends BaseThumbnailGenerator {
    private static final Logger logger = LogManager.getLogger(CommandGenerator.class);

    /** List of command strings to execute for thumbnail generation. */

            assertNotNull(jobProcess2);
            // Since echo command completes quickly, processes might already be finished
            // So we just verify that processes were created without errors

            Set<String> sessionIds = processHelper.getRunningSessionIdSet();
            // Since echo commands complete quickly, we may not catch them running
            // Just verify no exceptions occurred

    protected void setUpChild() throws Exception {
        // Get the queryProcessor that was registered in parent class
        queryProcessor = ComponentUtil.getComponent("queryProcessor");

        // Register all query commands needed for testing
        new TermQueryCommand().register();
        new MatchAllQueryCommand().register();
        new PhraseQueryCommand().register();
        new BooleanQueryCommand().register();

        lastaEnv = env;
        return this;
    }

    /**
     * Adds a system property to the command list.
     * If the property exists in the system, it uses that value with optional append value.
     * Otherwise, it uses the default value if provided.
     *
     * @param cmdList the command list to add the property to
     * @param name the property name

        this.streamCloseTimeout = streamCloseTimeout;
    }

    /**
     * Sends a command to the process associated with the given session ID.
     * Uses finer-grained locking to avoid blocking other operations during I/O.
     *
     * @param sessionId unique identifier for the process session
     * @param command the command to send to the process
     * @throws JobNotFoundException if no process is found for the given session ID

                            }
                            if (Constants.CRAWLER_PROCESS_COMMAND_THREAD_DUMP.equals(command)) {
                                ThreadDumpUtil.printThreadDump();
                            } else {
                                logger.warn("Unknown process command: command={}", command);
                            }

import org.opensearch.search.sort.SortOrder;

/**
 * Abstract base class for query command implementations.
 * Provides common functionality for processing and executing search queries.
 */
public abstract class QueryCommand {

    /**
     * Default constructor for QueryCommand.
     * Creates a new instance of the query command with default settings.
     */
    public QueryCommand() {
        // Default constructor

import org.opensearch.monitor.process.ProcessProbe;

import jakarta.annotation.Resource;

/**
 * Executable class for generating thumbnails for indexed documents.
 * This class provides a command-line interface for thumbnail generation tasks.
 */
public class ThumbnailGenerator {

    private static final Logger logger = LogManager.getLogger(ThumbnailGenerator.class);

    /**