*
     * @return a string containing the path, mapping items, and ID of this file
     */
    @Override
    public String toString() {
        return "MappingFile [path=" + path + ", mappingItemList=" + mappingItemList + ", id=" + id + "]";
    }

    /**
     * Inner class for handling updates to the character mapping file.

labels.startTime=Start Time
labels.target=Target
labels.token=Token
labels.synonymFile=Synonym File
labels.stopwordsFile=Stopwords File
labels.stemmerOverrideFile=Stemmer Override File
labels.mappingFile=Mapping File
labels.protwordsFile=Protwords File
labels.kuromojiFile=Kuromoji File
labels.elevateWordFile=Elevate Word File
labels.badWordFile=Bad Word File
labels.urlExpr=Condition

    }

    // Test toString method
    public void test_toString() {
        String result = charMappingFile.toString();
        assertTrue(result.contains("MappingFile"));
        assertTrue(result.contains("path=" + testFile.getAbsolutePath()));
        assertTrue(result.contains("id=test_id"));
    }

    // Test get method with empty file

labels.scriptType=執行方法
labels.segmentation=分段
labels.startTime=開始時間
labels.target=目標
labels.token=令牌
labels.synonymFile=同義詞檔案
labels.stopwordsFile=停用詞檔案
labels.stemmerOverrideFile=詞幹覆蓋檔案
labels.mappingFile=映射檔案
labels.protwordsFile=Protwords檔案
labels.kuromojiFile=Kuromoji檔案
labels.elevateWordFile=提升詞檔案
labels.badWordFile=不良詞檔案
labels.urlExpr=條件
labels.boostExpr=提升值表達式
labels.confirmPassword=確認

        if (indexMappings == null || !indexMappings.containsKey("properties")) {
            String source = null;
            final String mappingFile = getResourcePath(indexConfigPath, fessConfig.getFesenType(), "/" + index + "/" + docType + ".json");
            try {
                source = FileUtil.readUTF8(mappingFile);
                if (DOC_INDEX.equals(index)) {
                    for (final UnaryOperator<String> rule : docMappingRewriteRuleList) {

labels.startTime=Startzeit
labels.target=Ziel
labels.token=Token
labels.synonymFile=Synonymdatei
labels.stopwordsFile=Stopwörterdatei
labels.stemmerOverrideFile=Stemmer-Überschreibungsdatei
labels.mappingFile=Zuordnungsdatei
labels.protwordsFile=Protwords-Datei
labels.kuromojiFile=Kuromoji-Datei
labels.elevateWordFile=Wortdatei erhöhen
labels.badWordFile=Schlechte-Wort-Datei
labels.urlExpr=Bedingung

labels.startTime=Godzina rozpoczęcia
labels.target=Cel
labels.token=Token
labels.synonymFile=Plik synonimów
labels.stopwordsFile=Plik stop-słów
labels.stemmerOverrideFile=Plik nadpisujący stemmer
labels.mappingFile=Plik mapowania
labels.protwordsFile=Plik protwords
labels.kuromojiFile=Plik kuromoji
labels.elevateWordFile=Plik słów podniesionych
labels.badWordFile=Plik słów zakazanych
labels.urlExpr=Warunek

labels.startTime=Start Time
labels.target=Target
labels.token=Token
labels.synonymFile=Synonym File
labels.stopwordsFile=Stopwords File
labels.stemmerOverrideFile=Stemmer Override File
labels.mappingFile=Mapping File
labels.protwordsFile=Protwords File
labels.kuromojiFile=Kuromoji File
labels.elevateWordFile=Elevate Word File
labels.badWordFile=Bad Word File
labels.urlExpr=Condition

labels.startTime=Hora de inicio
labels.target=Objetivo
labels.token=Token
labels.synonymFile=Archivo de sinónimos
labels.stopwordsFile=Archivo de palabras vacías
labels.stemmerOverrideFile=Archivo de anulación de Stemmer
labels.mappingFile=Archivo de mapeo
labels.protwordsFile=Archivo Protwords
labels.kuromojiFile=Archivo Kuromoji
labels.elevateWordFile=Archivo de palabras elevadas
labels.badWordFile=Archivo de palabras no deseadas

labels.scriptType=실행 방법
labels.segmentation=분할
labels.startTime=시작 시간
labels.target=대상
labels.token=토큰
labels.synonymFile=동의어 파일
labels.stopwordsFile=불용어 파일
labels.stemmerOverrideFile=Stemmer 덮어쓰기 파일
labels.mappingFile=매핑 파일
labels.protwordsFile=Protwords 파일
labels.kuromojiFile=Kuromoji 파일
labels.elevateWordFile=추가 단어 파일
labels.badWordFile=제외 단어 파일
labels.urlExpr=조건
labels.boostExpr=부스트 값 식
labels.confirmPassword=확인