Handles all indexing operations, content parsing, and word management (bad words, elevate words).

### SuggestSettings (Configuration)
Location: `src/main/java/org/codelibs/fess/suggest/settings/SuggestSettings.java`

Manages configuration stored in OpenSearch: analyzers, bad words, elevate words, timeouts.

### SuggestItem (Domain Entity)

errors.failed_to_upload_stopwords_file = Impossibile caricare il file delle stopwords.
errors.failed_to_download_elevate_file = Impossibile scaricare il file delle parole elevate.
errors.failed_to_upload_elevate_file = Impossibile caricare il file delle parole elevate.
errors.failed_to_download_badword_file = Impossibile scaricare il file delle parole proibite.
errors.failed_to_upload_badword_file = Impossibile caricare il file delle parole proibite.

errors.failed_to_upload_stopwords_file = Gagal mengunggah berkas stopwords.
errors.failed_to_download_elevate_file = Gagal mengunduh berkas elevate word.
errors.failed_to_upload_elevate_file = Gagal mengunggah berkas elevate word.
errors.failed_to_download_badword_file = Gagal mengunduh berkas bad word.
errors.failed_to_upload_badword_file = Gagal mengunggah berkas bad word.

errors.failed_to_upload_stopwords_file = Failed to upload a stopwords file.
errors.failed_to_download_elevate_file = Failed to download an elevate word file.
errors.failed_to_upload_elevate_file = Failed to upload an elevate word file.
errors.failed_to_download_badword_file = Failed to download a bad word file.
errors.failed_to_upload_badword_file = Failed to upload a bad word file.

errors.failed_to_upload_stopwords_file = Failed to upload a stopwords file.
errors.failed_to_download_elevate_file = Failed to download an elevate word file.
errors.failed_to_upload_elevate_file = Failed to upload an elevate word file.
errors.failed_to_download_badword_file = Failed to download a bad word file.
errors.failed_to_upload_badword_file = Failed to upload a bad word file.

labels.suggest_word_number=Количество слов
labels.suggest_word_type_all=Все
labels.suggest_word_type_document=Документ
labels.suggest_word_type_query=Запрос
labels.elevate_word_configuration=Elevate Word
labels.elevate_word_title_details=Elevate Word
labels.elevate_word_link_list=Список
labels.elevate_word_link_create=Создать новый
labels.elevate_word_link_edit=Редактировать
labels.elevate_word_link_delete=Удалить

    public static final String LOG_TYPE_SEARCH_USER_DAY = "search_user_day_agg";

    /** Log type constant for hourly average request time aggregation. */
    public static final String LOG_TYPE_SEARCH_REQTIMEAVG_HOUR = "search_reqtimeavg_hour_agg";

    /** Log type constant for daily average request time aggregation. */
    public static final String LOG_TYPE_SEARCH_REQTIMEAVG_DAY = "search_reqtimeavg_day_agg";

 *       <ul>
 *         <li>2 levels: average of 64ns per lock()/unlock()
 *         <li>3 levels: average of 77ns per lock()/unlock()
 *         <li>4 levels: average of 99ns per lock()/unlock()
 *         <li>5 levels: average of 103ns per lock()/unlock()
 *         <li>10 levels: average of 184ns per lock()/unlock()
 *         <li>20 levels: average of 393ns per lock()/unlock()
 *       </ul>
 * </ul>
 *

    // Tests for elevate word error handling
    // ============================================================

    @Test
    public void test_deleteNonExistentElevateWord() throws Exception {
        SuggestDeleteResponse response = suggester.indexer().deleteElevateWord("non-existent", true);

        assertNotNull(response);
        // Deleting non-existent elevate word should not error

	pluginAuthnServiceSuccAvgRttMsMinuteMD   = NewCounterMD(pluginAuthnServiceSuccAvgRttMsMinute, "When plugin authentication is configured, returns average round-trip-time of successful requests in the last full minute")