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> {

    /** LDAP admin security credentials configuration key. */
    public static final String LDAP_ADMIN_SECURITY_CREDENTIALS = "ldap.admin.security.credentials";

    /** LDAP provider URL configuration key. */
    public static final String LDAP_PROVIDER_URL = "ldap.provider.url";

    /** LDAP security authentication configuration key. */
    public static final String LDAP_SECURITY_AUTHENTICATION = "ldap.security.authentication";

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.
     */

            // This is a critical security vulnerability. The ID token should be validated
            // to ensure it was issued by the expected OpenID Connect provider and has not been tampered with.
            // TODO: Implement JWT signature validation using the provider's public key

            final Map<String, Object> attributes = new HashMap<>();
            attributes.put("accesstoken", tr.getAccessToken());

			<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>

 *
 * <p>This authenticator enables Single Sign-On (SSO) using SAML 2.0 protocol
 * with Identity Providers such as Okta, Azure AD, OneLogin, etc.</p>
 *
 * <h2>Required Configuration</h2>
 * <p>Add the following properties to {@code system.properties}:</p>
 * <pre>
 * # Enable SAML SSO
 * sso.type=saml
 *
 * # Identity Provider settings (obtain from your IdP)
 * saml.idp.entityid=http://www.okta.com/xxxxx

			<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>