if (response.isAcknowledged()) {
                    logger.info("[Rebuild] Switched aliases from {} to {}", oldIndexName, newIndexName);
                    return true;
                }
                logger.warn("[Rebuild] Alias switch not acknowledged from {} to {}", oldIndexName, newIndexName);
            }

     * do, when columnKeys is empty but rowKeys isn't, rowKeyList() can contain
     * elements but rowKeySet() will be empty and containsRow() won't
     * acknowledge them.
     */
    rowKeyToIndex = Maps.indexMap(rowList);
    columnKeyToIndex = Maps.indexMap(columnList);

    @SuppressWarnings("unchecked")