assertTrue(result);
        // Each of the 4 indices should have createAlias called
        assertEquals("createAlias should be called for each index", 4, testClient.createAliasCalls.size());
        assertTrue(testClient.calledMethods.contains("createAlias"));
    }

    // ==========================================================================

            // No alias configuration found - create aliases normally (does NOT remove old aliases)
            logger.warn("[Rebuild] No alias config found for {}, falling back to createAlias (old aliases NOT removed)", configIndex);
            createAlias(configIndex, newIndexName);
            return true;
        } catch (final Exception e) {