crawler.crawlerContext.setNumOfThread(5);
        crawler.urlFilter.addInclude("https://example.com/.*");
        
        // Execute crawling
        String sessionId = crawler.execute();
        System.out.println("Crawling completed. Session ID: " + sessionId);
    }
}
```

### File System Crawling

```java
import org.codelibs.fess.crawler.client.fs.FileSystemClient;

// Configure for file system crawling

     * @param sessionId The session ID.
     */
    @Override
    public void delete(final String sessionId) {
        deleteBySessionId(sessionId);
    }

    /**
     * Gets an access result by session ID and URL.
     *
     * @param sessionId The session ID.
     * @param url The URL.
     * @return The access result, or null if not found.
     */
    @Override

     *
     * @param parentUrl the parent URL to get encoding for
     * @param sessionId the session ID for the crawling session
     * @return the character encoding, or null if not found
     */
    default String getParentEncoding(final String parentUrl, final String sessionId) {
        final String key = sessionId + ":" + parentUrl;
        String enc = parentEncodingMap.get(key);
        if (enc != null) {

        context.put("thread", Thread.currentThread().getName());
        context.put("threadId", Thread.currentThread().getId());

        String sessionId = MDC.get("sessionId");
        if (sessionId != null) {
            context.put("sessionId", sessionId);
        }
        String userId = MDC.get("userId");
        if (userId != null) {
            context.put("userId", userId);
        }
    }

     */
    @Override
    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
        builder.startObject();
        if (sessionId != null) {
            builder.field(SESSION_ID, sessionId);
        }
        if (method != null) {
            builder.field(METHOD, method);
        }
        if (url != null) {
            builder.field(URL, url);
        }

    @DisplayName("Test setSessionId method")
    void testSetSessionId() {
        // Given
        long sessionId = 987654321L;
        doNothing().when(messageBlock).setSessionId(sessionId);

        // When
        messageBlock.setSessionId(sessionId);

        // Then
        verify(messageBlock).setSessionId(sessionId);
    }

    @Test
    @DisplayName("Test setSessionId with boundary values")

     */
    @Override
    public XContentBuilder toXContent(final XContentBuilder builder, final Params params) throws IOException {
        builder.startObject();
        if (sessionId != null) {
            builder.field(SESSION_ID, sessionId);
        }
        if (ruleId != null) {
            builder.field(RULE_ID, ruleId);
        }
        if (url != null) {
            builder.field(URL, url);
        }

     * Initiates crawling for specified web and file configurations.
     *
     * @param sessionId The session ID for this crawling operation
     * @param webConfigIdList List of web configuration IDs to crawl, null for all
     * @param fileConfigIdList List of file configuration IDs to crawl, null for all
     */
    public void crawl(final String sessionId, final List<String> webConfigIdList, final List<String> fileConfigIdList) {

        // Get the sessionId field using reflection
        Field sessionIdField = NtlmPasswordAuthenticator.class.getDeclaredField("sessionId");
        sessionIdField.setAccessible(true);

        // Initially sessionId should be null
        String initialSessionId = (String) sessionIdField.get(authenticator);
        assertNull(initialSessionId, "SessionId should initially be null");
    }

    @Test

                return;
            }
            final String sessionId = initParamMap.getAsString(Constants.SESSION_ID);
            if (StringUtil.isBlank(sessionId)) {
                logger.warn("[{}] Cannot delete stale documents: sessionId is not set.", dataConfig.getName());
                return;
            }