so the command instructs evince to open on the specified page and highlight/move to the first occurrence of the word
from http://manpages.ubuntu.com/manpages/wily/man1/evince.1.html

    --page-index=NUMBER
                  Open the document on the page  with  the  specified  page  index
                  (this is the exact page number, not a page label).

    --find=string
                  You  can  pass  a word or phrase here. If it exists, evince will
                  display the document and the first match.

the actual command "evince --page-index=%p --find=%s %f" is copied from recoll (http://www.lesbonscomptes.com/recoll/)
in "user preferences"-> "choose editor applications" i can use okular here, but cannot get the same functionality which is very important (i have had to install evince for this single use case!)
since you have documentation and application (evince) to benchmark, I assume this is clear?
Nicholas
On 17 September 2016 at 14:01, Ahmed Hussein via KDE Bugzilla <bugzilla_noreply@kde.org> wrote:

> https://bugs.kde.org/show_bug.cgi?id=362038
> Ahmed Hussein <thelastrealdevil@gmail.com> changed:
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |thelastrealdevil@gmail.com
> --- Comment #1 from Ahmed Hussein <thelastrealdevil@gmail.com> ---
> This is my first Bug. I want more info for this bug.
> 1. I implement find Arg and read it "--find <string>". What do you mean with
> --page-index?
> 2. I don't understand what should i do with page Arg. Should I highlight search
> only or force to first selected word.
> --
> You are receiving this mail because:
> You reported the bug.