}

        suggester.indexer().index(items);
        suggester.refresh();

        assertEquals(3, suggester.getAllWordsNum());

        SuggestDeleteResponse deleteResponse = suggester.indexer().deleteAll();

        assertNotNull(deleteResponse);
        assertFalse(deleteResponse.hasError());

        suggester.refresh();
        assertEquals(0, suggester.getAllWordsNum());
    }

    @Test

        runner.refresh();

        assertEquals(3, suggester.getAllWordsNum());

        SuggestWriterResult result = writer.deleteByQuery(runner.client(), suggester.settings(), suggester.getIndex(),
                QueryBuilders.matchQuery(FieldNames.TEXT, "テスト0"));

        assertNotNull(result);
        assertFalse(result.hasFailure());

        runner.refresh();

        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "SuggesterTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_indexAndSuggest() throws Exception {
        SuggestItem[] items = getItemSet1();
        suggester.indexer().index(items);
        suggester.refresh();

     */
    public void deleteBadWord(final String badWord) {
        suggester.indexer().deleteBadWord(badWord);
        refresh();
    }

    /**
     * Refreshes the suggest index.
     */
    public synchronized void refresh() {
        suggester.refresh();
        if (popularWordHelper != null) {
            popularWordHelper.clearCache();
        }
    }

    /**

            } catch (final Exception e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Silent token refresh failed: {}", e.getMessage());
                }
            }
            // For MSAL4J, if silent refresh fails, return true if token is still valid
            // Actual refresh will happen during next authentication request
            return true;
        }

        /**

        runner.close();
        runner.clean();
    }

    @Before
    public void before() throws Exception {
        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "SuggestRequestBuilderTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_basicBuilder() throws Exception {

        runner.close();
        runner.clean();
    }

    @Before
    public void before() throws Exception {
        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "PopularWordsRequestTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_basicRequest() throws Exception {

        runner.close();
        runner.clean();
    }

    @Before
    public void before() throws Exception {
        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "PopularWordsRequestBuilderTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_basicBuilder() throws Exception {

     * This operation ensures that all pending writes are persisted and searchable.
     *
     * @param searchEngineClient the search engine client to use for refresh
     * @param index the index name to refresh
     * @return the refresh status code
     */
    protected int refreshIndex(final SearchEngineClient searchEngineClient, final String index) {

### Testing Best Practices

- Minimize `Thread.sleep()` - use only when absolutely necessary
- For timestamp tests: use minimal delays (50-100ms)
- Clean only test-specific indices (not `_all` unless needed)
- Use `runner.refresh()` after index operations
- Test with realistic multilingual content

### Key Test Classes

- `SuggesterRefactoringTest` - Index lifecycle, alias management
- `SuggesterTest` - Core functionality