How to resolve search indexing failure: failed to locate system field info for item

If you find that items are properly queued to be indexed, but not processed through the queue, and you see the following stack trace in the log:

ERROR [com.percussion.FTSIndexQueue] An unexpected exception occurred. The reason was: failed to locate system field info for item with id: <ID>. Please consult the log for further information.
An internal error (end-condition) was encountered. An unexpected exception occurred:
An unexpected exception occurred. The reason was: failed to locate system field info for item with id: <ID>. Please consult the log for further information…The call-stack was:
java.lang.RuntimeException: failed to locate system field info for item with id: at com.percussion.search.PSSearchIndexEventQueue.indexItemChanges(Unknown Source) at com.percussion.search.PSSearchIndexEventQueue.processNextEventSet(Unknown Source) at com.percussion.search.PSSearchIndexEventQueue.access$100(Unknown Source) at com.percussion.search.PSSearchIndexEventQueue$1.run(Unknown Source)

To resolve the issue, please add the internal user ‘rxserver’ as a member of your workflow administrator role.
Instructions are found here: http://forum.percussion.com/showthread.php?10238-How-to-add-rxserver-to-the-workflow-administrator-role

You can find all console command for search under the online help menu located in the “Admin” tab when you login to the content explorer.