PulsingCodec can provides good gains, by inlining the postings into the terms dict for rare terms. This is especially helpful for primary key like fields, since every term is rare and batch lookups are common (see http://chbits.blogspot.com/2010/06/lucenes-pulsingcodec-on-primary-key.html for a simple perf test), but it should also be a gain for ordinary fields, thanks to Zipf's law.
I think we should make it the default....
|Field||Original Value||New Value|
|Workflow||jira [ 12512718 ]||Default workflow, editable Closed status [ 12563333 ]|
|Workflow||Default workflow, editable Closed status [ 12563333 ]||jira [ 12584448 ]|
|Fix Version/s||4.1 [ 12321140 ]|
|Fix Version/s||4.0 [ 12314025 ]|
|Status||Open [ 1 ]||Resolved [ 5 ]|
|Resolution||Duplicate [ 3 ]|
|Status||Resolved [ 5 ]||Closed [ 6 ]|