assertEquals("instance3", transformer3.getName());

        // Change one instance's name
        transformer2.setName("changed2");

        // Others should remain unchanged
        assertEquals("instance1", transformer1.getName());
        assertEquals("changed2", transformer2.getName());
        assertEquals("instance3", transformer3.getName());
    }

    /**

## Contributing

We welcome contributions to Fess Crawler! Please follow these guidelines:

1. **Fork** the repository
2. **Create** a feature branch (`git checkout -b feature/amazing-feature`)
3. **Commit** your changes (`git commit -m 'Add amazing feature'`)
4. **Push** to the branch (`git push origin feature/amazing-feature`)
5. **Open** a Pull Request

### Development Setup

```bash
# Clone the repository

        this.lastmod = lastmod;
    }

    /**
     * Returns the change frequency of this sitemap entry.
     * @return the change frequency
     */
    public String getChangefreq() {
        return changefreq;
    }

    /**
     * Sets the change frequency of this sitemap entry.
     * @param changefreq the change frequency to set
     */
    public void setChangefreq(final String changefreq) {

        assertSame(processor1, registeredRule.getResponseProcessor());

        // Change properties after registration
        TestResponseProcessor processor2 = new TestResponseProcessor();
        testRule.setRuleId("changedId");
        testRule.setResponseProcessor(processor2);

        // Verify changes are reflected (same object reference)
        assertEquals("changedId", registeredRule.getRuleId());

3. Follow coding standards: `mvn formatter:format`
4. Add tests for new functionality
5. Ensure all tests pass: `mvn test`
6. Check license headers: `mvn license:format`
7. Commit changes: `git commit -m 'Add amazing feature'`
8. Push to branch: `git push origin feature/amazing-feature`
9. Open a Pull Request

### Code Style

 *
 * <p>The class is thread-safe due to the use of {@code synchronized} keyword on methods that
 * modify the internal data structures. The internal maps are also declared as {@code volatile}
 * to ensure visibility of changes across threads.
 *
 * <p>The class also provides methods to manage URL patterns for inclusion and exclusion, which
 * are stored as {@code Pattern} objects.
 */
public class MemoryDataHelper {

        assertSame(listener, factory.getOnDestroyListener());

        factory.setOnDestroyListener(null);
        assertNull(factory.getOnDestroyListener());
    }

    /**
     * Test multiple listener changes
     */
    public void test_multipleListenerChanges() throws Exception {
        TestComponent component = new TestComponent();
        PooledObject<TestComponent> pooledObject = new DefaultPooledObject<>(component);

        } catch (final IOException e) {
            throw new OpenSearchAccessException("Failed to convert " + target + " to JSON.", e);
        }
    }

    /**
     * Refreshes the OpenSearch index to make recent changes visible for search.
     *
     * @return The RefreshResponse from OpenSearch.
     * @throws OpenSearchAccessException if the refresh operation fails.
     */
    protected RefreshResponse refresh() {
        try {

      (a) You must give any other recipients of the Work or
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      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
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      (a) You must give any other recipients of the Work or
          Derivative Works a copy of this License; and

      (b) You must cause any modified files to carry prominent notices
          stating that You changed the files; and

      (c) You must retain, in the Source form of any Derivative Works
          that You distribute, all copyright, patent, trademark, and
          attribution notices from the Source form of the Work,