yaz_log(log_level, "zebra_flush_reg");
zebraExplain_flush (zh->reg->zei, zh);
extract_flushWriteKeys (zh, 1 /* final */);
zebra_index_merge (zh );
yaz_log(log_level, "zebra_flush_reg");
zebraExplain_flush (zh->reg->zei, zh);
extract_flushWriteKeys (zh, 1 /* final */);
zebra_index_merge (zh );