Thanks Eli! I confirm the fix in eldoc hints and isearch prompt.
Closing this bug.
On Fri, Jul 8, 2016 at 3:50 PM Eli Zaretskii <eliz@gnu.org> wrote:
> Instead of "Isearch: " showing in a different face than that of the use input in the minibuffer, "Isearch: " prompt
> + user input search string showed up in the same face.