Main operations: `suggest()`, `popularWords()`, `indexer()`, `createIndexIfNothing()`, `createNextIndex()`, `switchIndex()`, `removeDisableIndices()`

### SuggestIndexer (Indexing Engine)
Location: `src/main/java/org/codelibs/fess/suggest/index/SuggestIndexer.java`

Handles all indexing operations, content parsing, and word management (bad words, elevate words).

### SuggestSettings (Configuration)

            // Process objects (files)
            for (final S3Object s3Object : response.contents()) {
                final String objectKey = s3Object.key();
                // Skip directory markers (objects ending with /)
                if (!objectKey.endsWith("/")) {
                    final String fileName = getName(objectKey);
                    final ZonedDateTime lastModified =

                repositories {
                    mavenCentral()
                }

                dependencies {
                    "testImplementation"("org.junit.jupiter:junit-jupiter-engine:5.8.1")
                    "testRuntimeOnly"("org.junit.platform:junit-platform-launcher")
                }

                tasks.named<Test>("test").configure {

import org.lastaflute.web.response.StreamResponse;

import jakarta.annotation.Resource;

/**
 * API action for admin bad word management.
 * Provides REST endpoints for managing bad words in the Fess search engine.
 */
public class ApiAdminBadwordAction extends FessApiAdminAction {

    /**
     * Default constructor.
     */
    public ApiAdminBadwordAction() {
        super();
    }

  auto entry = GetFactories().find(name);
  if (entry != GetFactories().end()) {
    default_factory = GetFactories().find(name)->second;
    return absl::OkStatus();
  }
  string msg = absl::StrCat(
      "No tracing engine factory has been registered with the key '", name,
      "' (available: ");
  // Ensure deterministic (sorted) order in the error message
  std::set<string> factories_sorted;
  for (const auto& factory : GetFactories())

  ':example-plugins:painless-whitelist',
  ':example-plugins:rescore',
  ':example-plugins:rest-handler',
  ':example-plugins:script-expert-scoring',
  ':example-plugins:security-authorization-engine',
  ':libs:elasticsearch-cli',
  ':libs:elasticsearch-core',
  ':libs:elasticsearch-dissect',
  ':libs:elasticsearch-geo',
  ':libs:elasticsearch-grok',
  ':libs:elasticsearch-lz4',
  ':libs:elasticsearch-nio',

import org.codelibs.fess.util.JobProcess;
import org.codelibs.fess.util.SystemUtil;

import jakarta.servlet.ServletContext;

/**
 * Job for executing Python scripts within the Fess search engine environment.
 * This job extends ExecJob to provide Python-specific functionality for running
 * Python scripts with proper environment setup and argument passing.
 *

    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
  }

  /**
   * Regression test for an edge case where closing response body in the HTTP engine doesn't release
   * the corresponding stream allocation. This test keeps those response bodies alive and reads
   * them after the redirect has completed. This forces a connection to not be reused where it would

import org.opensearch.monitor.os.OsProbe;
import org.opensearch.monitor.process.ProcessProbe;

import jakarta.annotation.Resource;

/**
 * Main executable class for running crawling operations in the Fess search engine.
 * This class serves as the entry point for crawling web content, file systems, and data stores.
 * It manages the crawling lifecycle, including initialization, execution coordination,
 * monitoring, and cleanup operations.
 *

    private static final Logger logger = LogManager.getLogger(BadWordService.class);

    /** Database behavior for bad word operations. */
    @Resource
    protected BadWordBhv badWordBhv;

    /** Search engine client for index operations. */
    @Resource
    protected SearchEngineClient searchEngineClient;

    /** Fess configuration. */
    @Resource
    protected FessConfig fessConfig;

    /**