}

    /**
     * Executes the document purging job.
     * Removes all documents from the search index that have expired based on their expires field.
     *
     * @return a string containing the execution result and any error messages
     */
    public String execute() {
        final SearchEngineClient searchEngineClient = ComponentUtil.getSearchEngineClient();

 *
 * This class ensures that at most one thread is running at a time. This is initially the JUnit test
 * thread, which yields its execution privilege while calling [runTasks], [runNextTask], or
 * [advanceUntil]. These functions don't return until the task threads are all idle.
 *
 * Task threads release their execution privilege in these ways:
 *
 *  * By yielding in [TaskRunner.Backend.coordinatorWait].
 *  * By yielding in [BlockingQueue.poll].

 */
package org.apache.maven.plugin;

/**
 * An exception occurring during the execution of a plugin (such as a compilation failure).<br>
 * Throwing this exception causes a "BUILD FAILURE" message to be displayed.
 *
 */
public class MojoFailureException extends AbstractMojoExecutionException {
    /**
     * Construct a new <code>MojoFailureException</code> exception providing the source and a short and long message:

        return TestUtils.createMockContext();
    }

    @Nested
    @DisplayName("Strategy Execution")
    class StrategyExecutionTests {

        @Test
        @DisplayName("should execute all applicable strategies")
        void shouldExecuteAllApplicableStrategies() throws Exception {
            UpgradeContext context = createMockContext();

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.execution;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.artifact.versioning.ArtifactVersion;

    @Override
    public void executionFailure(String projectId, boolean halted, String exception) {}

    @Override
    public void mojoStarted(ExecutionEvent event) {}

    @Override
    public void finish(int exitCode) throws Exception {}

    @Override
    public void fail(Throwable t) throws Exception {}

    @Override
    public void log(String msg) {
        output.accept(msg);
    }

    // to suppress unexpected override by sub-class
    // you should remove the 'final' if you need to override this
    /**
     * Hook method called before action execution.
     * This method refreshes the user information if a user is logged in
     * and delegates to the view helper's action hook.
     *
     * @param runtime the action runtime context

 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.maven.plugin.internal;

import org.apache.maven.execution.MavenSession;
import org.apache.maven.plugin.descriptor.MojoDescriptor;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.PlexusConfiguration;

/**

└── fess-crawler-opensearch/  # OpenSearch backend
```

### Key Components

#### Core Engine
- **Crawler**: Main orchestrator managing crawl execution
- **CrawlerContext**: Execution context and configuration
- **CrawlerThread**: Individual crawler thread implementation

#### Client Architecture
- **HcHttpClient**: HTTP/HTTPS client using Apache HttpComponents

import javax.inject.Provider;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.maven.api.services.MessageBuilderFactory;
import org.apache.maven.execution.MavenSession;
import org.apache.maven.lifecycle.LifecycleExecutionException;
import org.apache.maven.lifecycle.internal.ExecutionEventCatapult;
import org.apache.maven.lifecycle.internal.LifecycleDependencyResolver;