Suggester suggester = createSuggester();

        // Multiple consecutive calls should be safe
        suggester.createIndexIfNothing();
        suggester.createIndexIfNothing();
        suggester.createIndexIfNothing();

        // Should still be able to use the index
        suggester.refresh();
        assertEquals("Index should work normally", 0, suggester.getAllWordsNum());

---

## Key Components

### Suggester (Main Entry Point)
Location: `src/main/java/org/codelibs/fess/suggest/Suggester.java`

Main operations: `suggest()`, `popularWords()`, `indexer()`, `createIndexIfNothing()`, `createNextIndex()`, `switchIndex()`, `removeDisableIndices()`

### SuggestIndexer (Indexing Engine)
Location: `src/main/java/org/codelibs/fess/suggest/index/SuggestIndexer.java`

                        .pluginTypes("org.codelibs.opensearch.extension.ExtensionPlugin"));
        runner.ensureYellow();
        suggester = Suggester.builder().build(runner.client(), TEST_ID);
        suggester.createIndexIfNothing();
    }

    @AfterClass
    public static void afterClass() throws Exception {
        runner.close();
        runner.clean();
    }

    @Before
    public void before() throws Exception {

                        .pluginTypes("org.codelibs.opensearch.extension.ExtensionPlugin"));
        runner.ensureYellow();
        suggester = Suggester.builder().build(runner.client(), TEST_ID);
        suggester.createIndexIfNothing();
        writer = new SuggestIndexWriter();
    }

    @AfterClass
    public static void afterClass() throws Exception {
        runner.close();
        runner.clean();
    }

    @Before

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

    @Before
    public void before() throws Exception {
        suggester = Suggester.builder().build(runner.client(), getTestId());
        suggester.createIndexIfNothing();
    }

    private String getTestId() {
        return ("suggest-indexer-test-" + testName.getMethodName()).toLowerCase(Locale.ROOT);
    }

    @Test