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

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";