explain.action does not return results in Confluence Data Center

Summary

The URL http://confluence.mycompany.com/explain.action?queryString=logo is not returning any results.

See

• How do I understand the ranking of Confluence's Search Results

Environment

• Confluence Data Centre 6.6.6

Steps to Reproduce

1. Using Confluence Data Centre 6.6.6 go to
   • http://confluence.mycompany.com/explain.action?queryString=logo

Expected Results

We should see

Actual Results

We actually see

Notes

This can be reproduced in Confluence 6.6.6, the Enterprise Release but not Confluence 6.10 Data Centre, nor Standalone.

Workaround

None