this.namespace = namespace;
        return this;
    }

    /**
     * Sets the document expiration period in days.
     * Controls how long crawled documents remain in the search index.
     *
     * @param documentExpires the expiration period: -2 (system default), -1 (never expire),
     *                       0 or positive (expire after specified days)

/**
 * Helper class for controlling crawler execution intervals and timing.
 * This class manages crawler execution timing based on configurable rules
 * that can specify different delays for different time periods and days.
 */
public class IntervalControlHelper {

    /** Flag indicating whether the crawler is currently running */
    protected volatile boolean crawlerRunning = true;

    /**
     * Default constructor.

- **i18n**: All user-facing strings in `fess_label_*.properties`
- **Default Port**: 8080 (configurable via `fess.port` system property)
- **Log Location**: `target/fess-logs/` (dev), `/var/log/fess/` (prod)
- **Admin Login**: `admin/admin`

## Log Message Guidelines

- Format parameters as `key=value` (e.g., `sessionId={}`, `url={}`)
- Prefix with `[name]` when context identification is needed

labels.search_click_views={0} weergaven
labels.search_result_more=Meer details..
labels.search_result_cache=Cache
labels.search_result_similar=Vergelijkbare resultaten ({0})
labels.facet_label_title=Label
labels.facet_timestamp_title=Periode
labels.facet_timestamp_1day=Afgelopen 24 uur
labels.facet_timestamp_1week=Afgelopen week
labels.facet_timestamp_1month=Afgelopen maand
labels.facet_timestamp_1year=Afgelopen jaar

labels.search_result_more=Mais detalhes..
labels.search_result_cache=Cache
labels.search_result_similar=Resultados semelhantes ({0})
labels.facet_label_title=Rótulo
labels.facet_timestamp_title=Período
labels.facet_timestamp_1day=Últimas 24 horas
labels.facet_timestamp_1week=Última semana
labels.facet_timestamp_1month=Último mês
labels.facet_timestamp_1year=Último ano
labels.facet_timestamp_3month=Últimos 3 meses

labels.search_click_views={0} visualizzazioni
labels.search_result_more=Dettagli..
labels.search_result_cache=Cache
labels.search_result_similar=Risultati simili ({0})
labels.facet_label_title=Etichetta
labels.facet_timestamp_title=Periodo
labels.facet_timestamp_1day=Ultime 24 ore
labels.facet_timestamp_1week=Ultima settimana
labels.facet_timestamp_1month=Ultimo mese
labels.facet_timestamp_1year=Ultimo anno
labels.facet_timestamp_3month=Ultimi 3 mesi

labels.search_click_views={0} vistas
labels.search_result_more=Más detalles..
labels.search_result_cache=Caché
labels.search_result_similar=Resultados similares ({0})
labels.facet_label_title=Etiqueta
labels.facet_timestamp_title=Período
labels.facet_timestamp_1day=Últimas 24 horas
labels.facet_timestamp_1week=Última semana
labels.facet_timestamp_1month=Último mes
labels.facet_timestamp_1year=Último año
labels.facet_timestamp_3month=Últimos 3 meses

ldap.admin.user.filter=uid\=%s
# Base DN for LDAP admin user.
ldap.admin.user.base.dn=ou\=People,dc\=fess,dc\=codelibs,dc\=org
# Object classes for LDAP admin user.
ldap.admin.user.object.classes=organizationalPerson,top,person,inetOrgPerson
# Role filter for LDAP admin.
ldap.admin.role.filter=cn\=%s
# Base DN for LDAP admin role.
ldap.admin.role.base.dn=ou\=Role,dc\=fess,dc\=codelibs,dc\=org
# Object classes for LDAP admin role.

    /** The key of the configuration. e.g. ou=People,dc=fess,dc=codelibs,dc=org */
    String LDAP_ADMIN_USER_BASE_DN = "ldap.admin.user.base.dn";

    /** The key of the configuration. e.g. organizationalPerson,top,person,inetOrgPerson */
    String LDAP_ADMIN_USER_OBJECT_CLASSES = "ldap.admin.user.object.classes";

    /** The key of the configuration. e.g. cn=%s */
    String LDAP_ADMIN_ROLE_FILTER = "ldap.admin.role.filter";