protected Writer writer;

        /** The mapping item being updated, or null for read-only operations. */
        protected CharMappingItem item;

        /**
         * Constructs a new MappingUpdater for handling file updates.
         *
         * @param newItem the character mapping item to update, or null for read-only operations
         */
        protected MappingUpdater(final CharMappingItem newItem) {

import jakarta.servlet.http.Cookie;
import jakarta.servlet.http.HttpServletRequest;

/**
 * Helper class for handling search operations in Fess.
 *
 * This class provides comprehensive search functionality including document search,
 * scroll search, and bulk operations. It handles search request parameter processing,
 * query building, response formatting, and search log management.
 *
 * Key features:

import com.google.common.cache.LoadingCache;
import com.ibm.icu.util.ULocale;

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;

/**
 * Helper class for system-level operations and utilities.
 * This class provides methods for managing system properties, handling JSP files,
 * normalizing configurations, and other system-related tasks.
 */
public class SystemHelper {

    /**