Thanks all , the problem is solved . I don't know how . I'm guessing it's an administrative issue
You probably need to rebuild the Search Index. You can follow those instructions if you're hosting your own version, or if you're a Cloud customer you can contact Atlassian support and they'll do it for you.
(Answer based on a previous question about the same problem)
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First off, be sure to add a space before the @.
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Do you see any errors in log?
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