--batch-size=BYTES flush changes to OS after a given number of bytes
--max-size=BYTES do not index messages larger than the given size
--reindex index previously indexed data (if upgrading)
+ --since=DATE limit --reindex to changes after DATE
+ --until=DATE limit --reindex to changes before DATE
--rethread regenerate thread IDs (if upgrading, use sparingly)
--prune prune git storage on discontiguous history
--verbose | -v increase verbosity (may be repeated)
fsync|sync! xapian_only|xapian-only
indexlevel|index-level|L=s max_size|max-size=s
batch_size|batch-size=s
+ since|after=s until|before=s
sequential-shard|seq-shard
no-update-extindex update-extindex|E=s@
fast-noop|F skip-docdata all C=s@ help|h))