On PTC downloads under Windchill PDMLink it's listed as Windchill Index Search. As of 10.x, it's SOLR (Microsoft).
- Once installed to Windchill there are multiple "solr" folders.
- Execute bulk indexing from a Windchill shell.
- Multiple additional queues appear.
- Database table INDEXSTATUS gets populated.
I wish there was a simple toggle in the Search UI's to utilize index search or not, but users have to change a preference.