**Solution**:
- Split large files into smaller batches (e.g., 10,000 docs per file)
- Increase timeout in `system.properties`:
  ```properties
  crawler.document.request.timeout=600000
  ```
- Use asynchronous import via Admin UI instead of API

#### Issue: Special characters in documents not displaying correctly

**Solution**:
- Ensure source files are UTF-8 encoded
- Check `fess_config.properties`:

import org.gradle.api.tasks.PathSensitivity;
import org.gradle.api.tasks.TaskAction;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.util.*;

/**
 * Checks adoc files for reversed multi-language snippet order.
 * Only rule enforced:
 *   In a ==== ... ==== block, if there are at least two [.multi-language-sample] snippets,

    }

    @Override
    public void merge(File current, File result) throws RepositoryException {
        try {
            if (current.exists()) {
                Files.createDirectories(result.toPath().getParent());
                Files.copy(current.toPath(), result.toPath());
            }
            ArtifactRepository localRepo = new MetadataRepository(result);
            metadata.storeInLocalRepository(localRepo, localRepo);

		return Info{}, err
	}
	reservedBlocks := uint64(s.Bfree) - uint64(s.Bavail)
	info = Info{
		Total:  uint64(s.Frsize) * (uint64(s.Blocks) - reservedBlocks),
		Free:   uint64(s.Frsize) * uint64(s.Bavail),
		Files:  uint64(s.Files),
		Ffree:  uint64(s.Ffree),
		FSType: getFSType(s.Fstr[:]),
	}
	if info.Free > info.Total {

import org.lastaflute.web.ruts.multipart.MultipartFormFile;
import org.lastaflute.web.validation.Required;

/**
 * Form for uploading search request files to the Fess search engine.
 * This form is used in the admin interface to upload search request configuration files
 * that define search behaviors and request handling.
 */
public class UploadForm {

    /**

java.io.RandomAccessFile
java.nio.file.Path#toFile()

@defaultMessage Specify a location for the temp file/directory instead.
java.nio.file.Files#createTempDirectory(java.lang.String,java.nio.file.attribute.FileAttribute[])
java.nio.file.Files#createTempFile(java.lang.String,java.lang.String,java.nio.file.attribute.FileAttribute[])

@defaultMessage Don't use java serialization - this can break BWC without noticing it

                        // The method should be idempotent, so we record all package-info.java files we ever allowed and allow them afterward.
                        return true;
                    }
                    String packageName = getPackageName(file);
                    // we pass through package-info.java files for packages we have not seen before, block the rest

    /** Dictionary manager for handling dictionary file operations */
    @Resource
    protected DictionaryManager dictionaryManager;

    /**
     * Retrieves all available dictionary files.
     *
     * @return JSON response containing list of dictionary files
     */
    // GET /api/admin/dict
    @Execute
    public JsonResponse<ApiResult> get$index() {

                                       parsed_args.whitelist_prefix):
      continue

    # In Python, MSYS, Linux-like paths are automatically read as Windows paths
    # with forward slashes, e.g. 'C:/Program Files', instead of
    # '/c/Program Files', thus becoming converted simply by virtue of having
    # been read.
    converted_vars[var] = value

  var_str = '\n'.join(f'{k}="{v}"'
                      for k, v in converted_vars.items())

import org.lastaflute.web.validation.Required;

/**
 * Form for uploading elevate word files to the Fess search engine.
 * Elevate words are terms that should be promoted or given higher ranking in search results.
 * This form is used in the admin interface to upload elevate word configuration files.
 */
public class UploadForm {

    /**