* managing document lifecycle operations (create, update, delete), and handling
 * thumbnail processing during indexing.
 *
 * <p>The IndexingHelper manages bulk operations, handles retries on failures,
 * and provides various query-based operations for document management.
 * It also integrates with the thumbnail generation system and handles
 * the cleanup of old documents during updates.</p>
 */

        new File(tempDir, "WEB-INF/lib").mkdirs();
        new File(tempDir, "WEB-INF/env/thumbnail/lib").mkdirs();
        new File(tempDir, "WEB-INF/plugin").mkdirs();

        thumbnailJob.numOfThreads(2);

        testProcessHelper.exitValue = 0;
        testProcessHelper.processOutput = "Thumbnail generation completed";

        String result = thumbnailJob.execute();

        assertNotNull(result);

thumbnail.html.image.format=png
# XPath to select images for thumbnails.
thumbnail.html.image.xpath=//IMG
# File extensions to exclude from thumbnail generation.
thumbnail.html.image.exclude.extensions=svg,html,css,js
# Interval for thumbnail generator.
thumbnail.generator.interval=0
# Targets for thumbnail generator (e.g., all).
thumbnail.generator.targets=all
# Whether the thumbnail crawler is enabled.

			filePattern="${log.file.basedir}/${domain.name}${backup.date.suffix}-%i.log.gz">
			<PatternLayout><Pattern>${log.pattern}</Pattern></PatternLayout><!-- <EcsLayout serviceName="fess" eventDataset="thumbnail" /> -->
			<Policies>
				<TimeBasedTriggeringPolicy />
				<SizeBasedTriggeringPolicy size="100 MB" />
			</Policies>
			<DefaultRolloverStrategy fileIndex="max" min="1"

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.thumbnail;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

					<c:if test="${thumbnailSupport && !empty doc.thumbnail}">
					<div class="me-3">
						<a class="link d-none d-sm-flex" href="${doc.url_link}" data-uri="${doc.url_link}" data-id="${doc.doc_id}"
							data-order="${s.index}"
						> <img src="${fe:url('/images/blank.png')}" alt="thumbnail"
							data-src="${fe:url('/thumbnail/')}?docId=${f:u(doc.doc_id)}&queryId=${f:u(queryId)}" class="thumbnail"
						>
						</a>
					</div>

import org.codelibs.fess.helper.SystemHelper;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.thumbnail.ThumbnailManager;
import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInfo;

        INGEST("fess-ingest"), //
        /** Script plugins */
        SCRIPT("fess-script"), //
        /** Web application plugins */
        WEBAPP("fess-webapp"), //
        /** Thumbnail generator plugins */
        THUMBNAIL("fess-thumbnail"), //
        /** Crawler plugins */
        CRAWLER("fess-crawler"), //
        /** LLM plugins */
        LLM("fess-llm"), //
        /** Unknown/generic JAR files */

     */
    @Size(max = 10)
    public String loginLink;

    /**
     * Enable or disable thumbnail generation for documents.
     * When enabled, thumbnails are generated for supported file types.
     */
    @Size(max = 10)
    public String thumbnail;

    /**
     * Types of crawling failures to ignore during crawling operations.

import org.codelibs.fess.helper.SearchHelper;
import org.codelibs.fess.helper.UserInfoHelper;
import org.codelibs.fess.mylasta.action.FessUserBean;
import org.codelibs.fess.query.QueryFieldConfig;
import org.codelibs.fess.thumbnail.ThumbnailManager;
import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.optional.OptionalThing;
import org.lastaflute.web.login.LoginManager;
import org.lastaflute.web.response.ActionResponse;