Fess is based on [OpenSearch](https://github.com/opensearch-project/OpenSearch), but knowledge/experience about OpenSearch is _not_ required. Fess provides an easy to use Administration GUI to configure the system via your browser.

import org.codelibs.fess.util.ComponentUtil;
import org.dbflute.optional.OptionalEntity;

/**
 * Character mapping file handler for managing character mapping dictionaries.
 * This class provides functionality to load, parse, and manage character mapping
 * rules that define how input characters should be transformed to output characters
 * during text analysis and search processing.
 *

 * This class handles reading, parsing, and updating files that contain
 * stemmer override rules, where each rule maps an input word to an
 * output stem. The file format is expected to be `input => output`.
 *
 * The class provides methods for retrieving, adding, updating, and
 * deleting stemmer override items, as well as reloading the dictionary
 * from its source file.
 */
public class StemmerOverrideFile extends DictionaryFile<StemmerOverrideItem> {

import com.fasterxml.jackson.databind.ObjectMapper;

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.
 *

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 {

    /**
     * Constructs a new system helper.
     */

			<artifactId>opensearch</artifactId>
			<version>${opensearch.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.apache.lucene</groupId>
			<artifactId>lucene-queryparser</artifactId>
			<version>${lucene.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.apache.logging.log4j</groupId>

			<plugin>
				<artifactId>maven-dependency-plugin</artifactId>
				<executions>
					<execution>
						<id>unpack-provided</id>
						<phase>generate-resources</phase>
						<goals>
							<goal>unpack-dependencies</goal>
						</goals>
						<configuration>
							<includeScope>provided</includeScope>
							<outputDirectory>${project.build.directory}/tomcat-lib</outputDirectory>
							<includes>**/*</includes>

		</dependency>
		<dependency>
			<groupId>jakarta.transaction</groupId>
			<artifactId>jakarta.transaction-api</artifactId>
			<version>${jakarta.transaction.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>org.codelibs</groupId>
			<artifactId>sai</artifactId>
			<version>${sai.version}</version>
		</dependency>
		<dependency>
			<groupId>junit</groupId>

		</dependency>
		<dependency>
			<groupId>jakarta.transaction</groupId>
			<artifactId>jakarta.transaction-api</artifactId>
			<version>${jakarta.transaction.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>