}

        /**
         * Sets the Fess-specific properties.
         * @param fessProps The Fess-specific properties.
         * @return This ApiSystemInfoResponse instance.
         */
        public ApiSystemInfoResponse fessProps(final List<Map<String, String>> fessProps) {
            this.fessProps = fessProps;
            return this;
        }

        /**
         * Sets the bug report properties.

        final List<Map<String, String>> propItems = getPropItems();
        return asJson(new ApiResult.ApiSystemInfoResponse().bugReportProps(bugReportItems)
                .envProps(envItems)
                .fessProps(fessPropItems)
                .systemProps(propItems)
                .status(ApiResult.Status.OK)
                .result());
    }

import org.lastaflute.web.validation.theme.typed.LongTypeValidator;
import org.opensearch.search.sort.SortBuilder;
import org.opensearch.search.sort.SortBuilders;
import org.opensearch.search.sort.SortOrder;

public interface FessProp {

    String API_PING_SEARCH_ENGINE_FIELD_SET = "apiPingSearchEngineFieldSet";

    String QUERY_HIGHLIGHT_TERMINAL_CHARS = "queryHighlightTerminalChars";

        ; fess = map:{
            ; path = ..
            ; freeGenList = list:{ env ; config ; label ; message ; mail ; template ; jsp ; doc }
            ; configPluginInterface = org.codelibs.fess.mylasta.direction.FessProp
            ; propertiesHtmlList = list:{ env ; config ; label ; message }
        }
    }

    ; isUseDefaultConfigAtGeneration = true
    # you can override (several) default settings like this:

```

This will regenerate:
- `src/main/java/org/codelibs/fess/mylasta/action/FessLabels.java`
- `src/main/java/org/codelibs/fess/mylasta/action/FessMessages.java`
- `src/main/java/org/codelibs/fess/mylasta/direction/FessProp.java`

### 5. Rebuild the Project

```bash
mvn clean package
```

### 6. Test the New Language

1. **Start Fess:**
   ```bash
   # Run the main class in your IDE

import org.codelibs.fess.ingest.IngestFactory;
import org.codelibs.fess.job.JobExecutor;
import org.codelibs.fess.ldap.LdapManager;
import org.codelibs.fess.mylasta.direction.FessConfig;
import org.codelibs.fess.mylasta.direction.FessProp;
import org.codelibs.fess.opensearch.client.SearchEngineClient;
import org.codelibs.fess.query.QueryFieldConfig;
import org.codelibs.fess.query.QueryProcessor;
import org.codelibs.fess.query.parser.QueryParser;

import org.lastaflute.core.direction.exception.ConfigPropertyNotFoundException;

/**
 * @author FreeGen
 */
public interface FessConfig extends FessEnv, org.codelibs.fess.mylasta.direction.FessProp {

    /** The key of the configuration. e.g. Fess */
    String DOMAIN_TITLE = "domain.title";

    /** The key of the configuration. e.g. default */
    String search_engine_TYPE = "search_engine.type";