indexer.webfs.commit.margin.time=5000
# Maximum number of empty lists for webfs in the indexer.
indexer.webfs.max.empty.list.count=3600
# Update interval (ms) for webfs in the indexer.
indexer.webfs.update.interval=10000
# Maximum document cache size for webfs in the indexer.
indexer.webfs.max.document.cache.size=10
# Maximum document request size (bytes) for webfs in the indexer.

        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;
        }

{"index":{"_index":"fess_config.scheduled_job","_id":"index_exporter"}}

        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 {

    /** The key of the configuration. e.g. fess_config */
    String INDEX_CONFIG_INDEX = "index.config.index";

    /** The key of the configuration. e.g. fess_user */
    String INDEX_USER_INDEX = "index.user.index";

    /** The key of the configuration. e.g. fess_log */
    String INDEX_LOG_INDEX = "index.log.index";

- **Composite**: NormalizerChain, ReadingConverterChain
- **Strategy**: Normalizer, ReadingConverter, ContentsParser
- **Deferred/Promise**: Async operations

### Index Alias Strategy

Zero-downtime index updates using dual aliases:

```
Index Naming: {baseIndex}.{timestamp}
Example:      my-suggest.20250123120000

Aliases:
├── Search Alias: {baseIndex}          (read operations)

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.