The simple search function is part of the core of JIRA and doesn't have any hooks for adding things to it. You'd need to amend the code of JIRA to change it, not just plug something in.
Atlassian provide the most commonly used fields and then provide all the other searchable fields under the "more" button, so I'm not sure what you'd want to add in there.
I'm John Allspaw, co-founder of Adaptive Capacity Labs, where we help teams use their incidents to learn and improve. We bring research-driven methods and approaches to drive effective inciden...
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