Unable to sort JQL Query result using Priority field
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
After upgrading from earlier version of JIRA, user was unable to sort the JQL query result according to the Priority field. This error message popped-out:

Diagnosis
There might be some inconsistencies or corruption in the index files.
Resolution
Run the Integrity Checker tool and then run Full Re-indexing in JIRA.
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