// Create next index - this is the main method we're testing
        Thread.sleep(1000); // Wait before creating next index (following existing test pattern)
        suggester.createNextIndex();
        Thread.sleep(100);

        // Verify that createNextIndex completed without exceptions
        // The update alias should now point to the new index
        final String updateAlias = suggester.getIndex() + ".update";

---

## 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`

 *   <li>{@link #shutdown()}: Shuts down the thread pool.</li>
 *   <li>{@link #createIndexIfNothing()}: Creates a new index if no index exists.</li>
 *   <li>{@link #createNextIndex()}: Creates a new index and replaces the current update alias with the new index.</li>
 *   <li>{@link #switchIndex()}: Switches the search alias to the current update index.</li>

            return 0;
        }

        final SuggestHelper suggestHelper = ComponentUtil.getSuggestHelper();

        logger.info("Creating new suggest index.");
        suggestHelper.suggester().createNextIndex();

        logger.info("Storing all bad words.");
        suggestHelper.storeAllBadWords(true);

        logger.info("Storing all elevate words.");
        suggestHelper.storeAllElevateWords(true);

        long currentMillis = System.currentTimeMillis();
        long millisUntilNextSecond = 1000 - (currentMillis % 1000);
        Thread.sleep(millisUntilNextSecond + 10); // +10ms buffer
        suggester.createNextIndex();
        SuggestItem[] items2 = getItemSet2();
        suggester.indexer().index(items2);
        suggester.refresh();