Issue search with worklog clause throws an error "An unknown error occurred while trying to perform a search."

Steps to reproduce:

1. Create a JIRA instance have more than 65000 issues with all worklog on each ticket before '2016-01-01'
2. Go to the issue search page and run the JQL worklogDate < '2016-01-01'

Expected behaviour

It should show the result with all issue.

Actual behaviour

It gives an error on the UI:
An unknown error occurred while trying to perform a search.

The same issue reproduced with the clause worklogAuthor

Workaround solution

• With the bug https://jira.atlassian.com/browse/JRA-64315, it is still possible to use the lower case clause which is worklogdate and worklogauthor to get the output.
• Reduce search scope for worklogDate function so it return less then 65000 issues