* Test getIndicesForAlias method with existing alias.
     * Verifies that the method correctly retrieves indices for a given alias.
     */
    @Test
    @SuppressWarnings("unchecked")
    public void testGetIndicesForAlias_existingAlias() throws Exception {
        final String indexName = "test-index-001";
        final String aliasName = "test-alias";

        // Create index with alias
        final CreateIndexResponse response =