JQL is failing with the error: An unknown error occurred while trying to perform a search.

Issue Summary

Simple JQL query field is empty search not working:

Error: An unknown error occurred while trying to perform a search.

Steps to Reproduce

1. Open Advanced issue search
2. Run the below query

 sprint is EMPTY ORDER BY Rank ASC

       3. execute the search

Expected Results

To show issues with no Sprint

Actual Results

The below exception is thrown in the har file:

from HAR:Request URL: https://demo.atlassian.net/secure/QueryComponent!Jql.jspa
Request Method: POST
Status Code: 400 
Remote Address: 104.192.137.19:443
Referrer Policy: same-origin
  "jqlTooComplex"  

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available