---

## 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`

        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 {
        indexQueryItems();

        PopularWordsResponse response = suggester.popularWords().setSize(10).execute().getResponse();

        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 {
        indexItems();

        PopularWordsResponse response = suggester.popularWords().execute().getResponse();

        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "SuggesterTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_Read() throws Exception {
        String indexName = "test-index";
        Client client = runner.client();
        SuggestSettings settings = suggester.settings();

        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(runner.client(), "AnalyzerNormalizerTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void test_constructor() throws Exception {
        AnalyzerNormalizer normalizer = new AnalyzerNormalizer(runner.client(), suggester.settings());
        assertNotNull(normalizer);

        runner.admin().indices().prepareDelete("_all").execute().actionGet();
        runner.refresh();
        suggester = Suggester.builder().build(client, "ScrollTest");
        suggester.createIndexIfNothing();
    }

    @Test
    public void testScrollSearch_emptyResults() {
        // Create index without any documents
        createTestIndex();

        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 {
        indexItems();

        SuggestResponse response = suggester.suggest().setQuery("test").execute().getResponse();