Pydantic, que es lo que impulsa toda la validación y serialización de datos en FastAPI, tiene un comportamiento especial cuando usas `Optional` o `Union[Something, None]` sin un valor por defecto, puedes leer más al respecto en la documentación de Pydantic sobre <a href="https://docs.pydantic.dev/2.3/usage/models/#required-optional-fields" class="external-link" target="_blank">Campos requeridos</a>.

///

/// tip | Consejo

import org.codelibs.fess.dict.DictionaryException;
import org.codelibs.fess.dict.DictionaryFile;
import org.codelibs.fess.util.ComponentUtil;
import org.codelibs.fess.util.KuromojiCSVUtil;
import org.dbflute.optional.OptionalEntity;

/**
 * A dictionary file for Kuromoji.
 */
public class KuromojiFile extends DictionaryFile<KuromojiItem> {
    private static final String KUROMOJI = "kuromoji";

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.codelibs.core.lang.StringUtil;
import org.codelibs.fess.Constants;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.dbflute.optional.OptionalEntity;
import org.lastaflute.web.util.LaServletContextUtil;

import jakarta.servlet.ServletContext;

/**
 * Utility class for accessing various resource paths and files in the Fess application.

        lastaEnv = env;
        return this;
    }

    /**
     * Adds a system property to the command list.
     * If the property exists in the system, it uses that value with optional append value.
     * Otherwise, it uses the default value if provided.
     *
     * @param cmdList the command list to add the property to
     * @param name the property name

### Technische Details zum JWT-„Subjekt“ `sub`

Die JWT-Spezifikation besagt, dass es einen Schlüssel `sub` mit dem Subjekt des Tokens gibt.

Die Verwendung ist optional, aber dort würden Sie die Identifikation des Benutzers speichern, daher verwenden wir das hier.

# Apache Maven Wrapper startup batch script, version 3.3.2
#
# Required ENV vars:
# ------------------
#   JAVA_HOME - location of a JDK home dir
#
# Optional ENV vars
# -----------------
#   MAVEN_OPTS - parameters passed to the Java VM when running Maven
#     e.g. to debug Maven itself, use
#       set MAVEN_OPTS=-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=8000

cn = "Sally Certowner"

# In how many days, counting from today, this certificate will expire.
expiration_days = 365

# X.509 v3 extensions

# DNS name(s) of the server
dns_name = "localhost"

# (Optional) Server IP address
ip_address = "127.0.0.1"

# Whether this certificate will be used for a TLS server
tls_www_server
```

Run `certtool.exe` and specify the configuration file to generate a certificate:

import org.codelibs.fess.opensearch.log.exentity.SearchLog;
import org.codelibs.fess.opensearch.log.exentity.UserInfo;
import org.codelibs.fess.taglib.FessFunctions;
import org.dbflute.optional.OptionalEntity;
import org.opensearch.search.aggregations.AggregationBuilders;
import org.opensearch.search.aggregations.BucketOrder;
import org.opensearch.search.aggregations.bucket.histogram.DateHistogramInterval;

 *
 * ### Query
 *
 * The query is optional: it can be null, empty, or non-empty. For many HTTP URLs the query string
 * is subdivided into a collection of name-value parameters. This class offers methods to set the
 * query as the single string, or as individual name-value parameters. With name-value parameters
 * the values are optional and names may be repeated.
 *
 * ### Fragment
 *

## 🚀 Getting Started

### Requirements
- **Java 21 or higher** (Required for modern language features)
- **Maven 3.6+** or **Gradle 7+** for build management
- **Optional**: SLF4J or Commons Logging for logging support

### Maven Dependency
```xml
<dependency>
    <groupId>org.codelibs</groupId>
    <artifactId>corelib</artifactId>
    <version>0.7.0</version>
</dependency>