There is a search REST API to return the people who is associated with the search result,
here:
http://www-10.lotus.com/ldd/lcwiki.nsf/dx/Retrieving_the_people_related_to_a_set_of_search_results_ic301
I wonder what the algorithm is to return the the people associated with the result ?
I tried one search, the result seems as if not so accurate.