import org.junit.Test;
import org.opensearch.action.admin.indices.alias.Alias;
import org.opensearch.action.admin.indices.alias.get.GetAliasesResponse;
import org.opensearch.action.admin.indices.create.CreateIndexResponse;
import org.opensearch.transport.client.Client;

/**
 * Test class for refactoring changes made to Suggester class.
 *
 * Tests cover:
 * - Index alias helper method (getIndicesForAlias)

     * Returns a list of indices associated with the given alias.
     * @param alias The alias name.
     * @return A list of index names associated with the alias.
     */
    private List<String> getIndicesForAlias(final String alias) {
        final List<String> indices = new ArrayList<>();
        final IndicesExistsResponse response =
                client.admin().indices().prepareExists(alias).execute().actionGet(suggestSettings.getIndicesTimeout());

- **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)
└── Update Alias: {baseIndex}.update   (write operations)
```

### Text Processing Pipeline

```

/**
 * Helper class for Samba-related operations.
 */
public class SambaHelper {

    private static final Logger logger = LogManager.getLogger(SambaHelper.class);

    /**
     * SID type for an alias.
     */
    public static final int SID_TYPE_ALIAS = 4;

    /**
     * SID type for a deleted account.
     */
    public static final int SID_TYPE_DELETED = 6;

    /**

                }
                final String alias = index;
                return asStream(filename).contentTypeOctetStream().stream(out -> {
                    try (final BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(out.stream(), Constants.CHARSET_UTF_8))) {
                        SearchEngineUtil.scroll(alias, hit -> {
                            try {

    protected void createAlias(final String index, final String createdIndexName) {
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        // alias
        final String aliasConfigDirPath = getResourcePath(indexConfigPath, fessConfig.getFesenType(), "/" + index + "/alias");
        try {
            final File aliasConfigDir = ResourceUtil.getResourceAsFile(aliasConfigDirPath);
            if (aliasConfigDir.isDirectory()) {