SuggestIndexer indexer = suggester.indexer();
        // Setting null index name should be allowed (though may cause issues later)
        indexer.setIndexName(null);
    }

    @Test
    public void test_setNullSupportedFields() throws Exception {
        SuggestIndexer indexer = suggester.indexer();
        // Setting null fields should be allowed
        indexer.setSupportedFields(null);
    }

        }
    }

    private static class MockSuggester {
        private MockSuggestIndexer indexer = new MockSuggestIndexer();
        private MockSuggestSettings settings = new MockSuggestSettings();

        public MockSuggestIndexer indexer() {
            return indexer;
        }

        public MockSuggestSettings settings() {
            return settings;
        }

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

        assertEquals("Should have 1 word in initial index", 1, suggester.getAllWordsNum());

        suggester.createNextIndex();

        // Index different data in new index (via update alias)
        String[][] readings2 = new String[1][];

        SuggestIndexer indexer = suggester.indexer();

        assertNotNull(indexer.setIndexName("test-index"));
        assertNotNull(indexer.setSupportedFields(new String[] { "field1", "field2" }));
        assertNotNull(indexer.setTagFieldNames(new String[] { "tag1", "tag2" }));
        assertNotNull(indexer.setRoleFieldName("role"));
        assertNotNull(indexer.setReadingConverter(null));

            if (logger.isDebugEnabled()) {
                logger.debug("Failed to create suggest index: index={}", index, e);
            }
            throw new SuggesterException("Failed to create suggest index: " + index, e);
        }
    }

    /**
     * Creates a new index and replaces the current update alias with the new index.
     */
    public void createNextIndex() {
        try {

import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.search.sort.SortOrder;

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;
import jakarta.annotation.Resource;

/**
 * IndexUpdater is responsible for updating the search index with crawled document data.

        private int maxEmptyListCount = 10;

        @Override
        public Integer getIndexerWebfsUpdateIntervalAsInteger() {
            return 100;
        }

        @Override
        public Integer getIndexerWebfsMaxEmptyListCountAsInteger() {
            return maxEmptyListCount;
        }

        @Override
        public Integer getIndexerWebfsMaxDocumentCacheSizeAsInteger() {
            return 100;
        }

        ensureOperations();
        return deletionOps.deleteOldWords(index, threshold);
    }

    /**
     * Sets the index name.
     * @param index The index name.
     * @return This SuggestIndexer instance.
     */
    public SuggestIndexer setIndexName(final String index) {
        this.index = index;
        return this;
    }

    /**
     * Sets the supported fields.

        suggester.indexer().deleteBadWord("[");
        suggester.indexer().deleteBadWord("ｴﾝｼﾞﾝ");
        assertEquals(0, suggester.settings().badword().get(false).length);
    }

    @Test
    public void test_popularWords() throws Exception {
        SuggestItem[] items = getPopularWordsItemSet2();
        suggester.indexer().index(items);
        suggester.refresh();

            suggester.indexer().addBadWord(word, apply);
        }
        refresh();
    }

    /**
     * Adds a bad word to the suggest index.
     *
     * @param badWord The bad word to add.
     * @param apply   true to apply the changes immediately.
     */
    public void addBadWord(final String badWord, final boolean apply) {
        suggester.indexer().addBadWord(badWord, apply);