Why a custom field is not available on the search bar?
If a custom field has a context project or type restriction it may not be shown on the search bar in Basic Mode.
You can:
Remove the Issue Type context from the custom field to re-enable the field in Basic mode
Change the Issue Type context to project based context
Add the custom field as default search field
Detailed explanation of the issue, including workarounds: https://confluence.atlassian.com/jirakb/custom-field-not-appearing-in-issue-navigator-search-criteria-125698089.html
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