+HTTP interface as it provides thread grouping in addition to
+normal search functionality.
+
+=head1 OPTIONS
+
+=over
+
+=item -j JOBS
+
+=item --jobs=JOBS
+
+Influences the number of Xapian indexing shards in a
+(L<public-inbox-v2-format(5)>) inbox.
+
+See L<public-inbox-init(1)/--jobs> for a full description
+of sharding.
+
+C<--jobs=0> is accepted as of public-inbox 1.6.0
+to disable parallel indexing regardless of the number of
+pre-existing shards.
+
+If the inbox has not been indexed or initialized, C<JOBS - 1>
+shards will be created (one job is always needed for indexing
+the overview and article number mapping).
+
+Default: the number of existing Xapian shards
+
+=item -c
+
+=item --compact
+
+Compacts the Xapian DBs after indexing. This is recommended
+when using C<--reindex> to avoid running out of disk space
+while indexing multiple inboxes.
+
+While option takes a negligible amount of time compared to
+C<--reindex>, it requires temporarily duplicating the entire
+contents of the Xapian DB.
+
+This switch may be specified twice, in which case compaction
+happens both before and after indexing to minimize the temporal
+footprint of the (re)indexing operation.
+
+Available since public-inbox 1.4.0.
+
+=item --reindex
+
+Forces a re-index of all messages in the inbox.
+This can be used for in-place upgrades and bugfixes while
+NNTP/HTTP server processes are utilizing the index. Keep in
+mind this roughly doubles the size of the already-large
+Xapian database. Using this with C<--compact> or running
+L<public-inbox-compact(1)> afterwards is recommended to
+release free space.
+
+public-inbox protects writes to various indices with
+L<flock(2)>, so it is safe to reindex (and rethread) while
+L<public-inbox-watch(1)>, L<public-inbox-mda(1)> or
+L<public-inbox-learn(1)> run.
+
+This does not touch the NNTP article number database.
+It does not affect threading unless C<--rethread> is
+used.
+
+=item --all
+
+Index all inboxes configured in ~/.public-inbox/config.
+This is an alternative to specifying individual inboxes directories
+on the command-line.
+
+=item --rethread
+
+Regenerate internal THREADID and message thread associations
+when reindexing.
+
+This fixes some bugs in older versions of public-inbox. While
+it is possible to use this without C<--reindex>, it makes little
+sense to do so.
+
+Available in public-inbox 1.6.0+.
+
+=item --prune
+
+Run L<git-gc(1)> to prune and expire reflogs if discontiguous history
+is detected. This is intended to be used in mirrors after running
+L<public-inbox-edit(1)> or L<public-inbox-purge(1)> to ensure data
+is expunged from mirrors.
+
+Available since public-inbox 1.2.0.
+
+=item --max-size SIZE
+
+Sets or overrides L</publicinbox.indexMaxSize> on a
+per-invocation basis. See L</publicinbox.indexMaxSize>
+below.
+
+Available since public-inbox 1.5.0.
+
+=item --batch-size SIZE
+
+Sets or overrides L</publicinbox.indexBatchSize> on a
+per-invocation basis. See L</publicinbox.indexBatchSize>
+below.
+
+When using rotational storage but abundant RAM, using a large
+value (e.g. C<500m>) with C<--sequential-shard> can
+significantly speed up and reduce fragmentation during the
+initial index and full C<--reindex> invocations (but not
+incremental updates).
+
+Available in public-inbox 1.6.0+.
+
+=item --no-fsync
+
+Disables L<fsync(2)> and L<fdatasync(2)> operations on SQLite
+and Xapian. This is only effective with Xapian 1.4+. This is
+primarily intended for systems with low RAM and the small
+(default) C<--batch-size=1m>. Users of large C<--batch-size>
+may even find disabling L<fdatasync(2)> causes too much dirty
+data to accumulate, resulting on latency spikes from writeback.
+
+Available in public-inbox 1.6.0+.
+
+=item --sequential-shard
+
+Sets or overrides L</publicinbox.indexSequentialShard> on a
+per-invocation basis. See L</publicinbox.indexSequentialShard>
+below.
+
+Available in public-inbox 1.6.0+.
+
+=item --skip-docdata
+
+Stop storing document data in Xapian on an existing inbox.
+
+See L<public-inbox-init(1)/--skip-docdata> for description and caveats.
+
+Available in public-inbox 1.6.0+.
+
+=item -E EXTINDEX
+
+=item --update-extindex=EXTINDEX
+
+Update the given external index (L<public-inbox-extindex-format(5)>.
+Either the configured section name (e.g. C<all>) or a directory name
+may be specified.
+
+Defaults to C<all> if C<[extindex "all"]> is configured,
+otherwise no external indices are updated.
+
+May be specified multiple times in rare cases where multiple
+external indices are configured.
+
+=item --no-update-extindex
+
+Do not update the C<all> external index by default. This negates
+all uses of C<-E> / C<--update-extindex=> on the command-line.
+
+=item --since=DATESTRING
+
+=item --after=DATESTRING
+
+=item --until=DATESTRING
+
+=item --before=DATESTRING
+
+Passed directly to L<git-log(1)> to limit changes for C<--reindex>
+
+=back