When I try to search the term 'ActivityNotFoundException' SP SE returns 0 search results. But posts containing this term actually exist (e.g. "The activity named 'WorkflowXaml_GUID' from scope was not found" when deploying SP 2013 Workflow).
I am guessing it has something to do with indexing tokens inside code block
because if I search for any other term in aforementioned post, I get search results.
Is it a possible bug?