Actually FishEye search functionality is not moving anywhere, it remains and will remain in FishEye. Bitbucket Server addressed completely another search algorithms what makes their search possibilities totally different from the experience FishEye is offering. So the answer you mentioned above is still valid, yes.
One of the key values of FishEye is its multi-SCMness. So if you're using non-Git repositories or several SCMs to manage your code, FishEye could still be handy. Together with Crucible it brings the powerful and sophisticated code search and code review possibilities, that gives your team's processes incredible flexibility.
If you already heard about Smart Commits in Bitbucket, know that you just stumbled upon something even better (and smarter!): Genius Commits by Better DevOps Automation for Jira Data Center (+ Server...
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