I know I can use the Common Searches tab to open the instance history of a particular workflow, and within that instance I can search by key words. What I would like to be able to do is search the instance history (all instances) for a key word.

For example, when I open a particular workflow and I see all instances in the search results, there could be a search box that allows me to filter or search all instances in the history for something like a vendor number, invoice number, or other key metadata referenced in the workflow.  This ability would greatly decrease research time when I'm trying to troubleshoot potential issues that don't necessarily generate an error that I can find in the logs.