When we do an Advanced Search for text ~ 'ABC XYZ'  or just a Quick Search for 'ABC XYZ' - Jira searches for strings 'ABC' and 'XYZ' within Description, Subject and Comments.

In the above scenario, we would show results only when both the strings ABC 'AND' XYZ are present in one of those fields. This can be made more flexible - Jira should show results when the strings ABC and XYZ are present in any of these fields (not necessary that they should be present in the same field).

For example - if ABC is present in Description and XYZ is present in Comments, it should be displayed.

Use case: Service Desk Agents are finding it difficult to search for quick information in Jira. They would like JQL Text Search to work similar to Outlook mail client (searching through indexed data). They really do not want to use the Advanced Search with explicit boolean operator like OR, because its a little time consuming (especially when you hold customers on call and searching for information).