### 3. Backup Existing System

Before migration:

1. Export current search configurations
2. Backup existing indices and data
3. Document custom integrations and API endpoints
4. Save user access control settings

---

## Migration Methods

### Google Search Appliance (GSA) / Google Mini

Fess provides comprehensive GSA migration support through configuration import and API compatibility.

        assertNotNull(paramAnnotations, "Parameter annotations should exist");
        assertEquals("Should have one parameter", 1, paramAnnotations.length);
        assertEquals("Parameter should have one annotation", 1, paramAnnotations[0].length);

        final UriType annotation = (UriType) paramAnnotations[0][0];

If you have ktlint errors, you can automatically fix them by running `mvn com.github.gantsign.maven:ktlint-maven-plugin:1.1.1:format`.

## How the configuration works

We use Kotlin portable DSL to store TeamCity configuration, which means you can easily create a new pipeline
based on a specific branch. Currently, we have two pipelines: `master` and `release`, but you can easily create

                labelConstantCount++;
            }
        }

        assertEquals("Should have exactly one serialVersionUID", 1, serialVersionUIDCount);
        assertTrue("Should have many label constants", labelConstantCount > 100);
    }

    /**
     * Test that label constant values match their field names
     */
    @Test

        copiedGroups.add("new-group");

        // Verify original is not modified
        assertEquals("Original list should have 1 element", 1, originalGroups.size());
        assertEquals("Copied list should have 2 elements", 2, copiedGroups.size());
    }

    /**
     * Test that processParentGroup handles null user gracefully when depth limit is reached.
     */
    @Test

However, the Java code we have is not fully annotated, which causes several consequences:
* IDE warnings can be misleading
* Redundant null checks may increase binary size, hurt performance, and increase cognitive load for readers
* Missing null checks may cause NullPointerException
* Bridging with Kotlin code is polluted with platform types

import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;

/**
 * Job for purging expired documents from the search index.
 * This job removes documents that have passed their expiration time based on the expires field.
 * It helps maintain the search index by cleaning up outdated content automatically.
 */
public class PurgeDocJob {

    /** Logger instance for this class */

            caughtSpecific = true;
        } catch (RuntimeException e) {
            caughtRuntime = true;
        }

        assertTrue("Should have caught DictionaryExpiredException", caughtSpecific);
        assertFalse("Should not have caught as RuntimeException", caughtRuntime);
    }

    @Test
    public void test_rethrow() {
        // Test rethrowing the exception

        valve1.setShowReport(true);
        valve1.setShowServerInfo(true);

        // valve2 should still have default values
        assertFalse("valve2 should have independent ShowReport setting", valve2.isShowReport());
        assertFalse("valve2 should have independent ShowServerInfo setting", valve2.isShowServerInfo());
    }

    @Test
    public void test_toggleSettingsMultipleTimes() {

,g,h){var i=h.disabledFormFilter?g.filter(h.disabledFormFilter):g,j=h.showErrorDialogs===c||h.showErrorDialogs,k=function(b,c,d){var e=a(this);d&&d.indexOf("blur")>-1?e.unbind("afterValidation",k):c.isValid?e.unbind("afterValidation",k):e.valAttr("have-been-blurred")||(c.shouldChangeDisplay=!1)};i.addClass(j?"disabled-with-errors":"disabled-without-errors").on("reset",function(){e(a(this),"disabled")}).find("*[data-validation]").valAttr("event","keyup change").on("validation",function(b,c){if(!f){f=!0;var...