Register the search stat modue with riak_core at app start time
Register the search stat modue with riak_core at app start time

So that the core stat cache will re-register the search mod
if the cache crashes

xuejianhai/riak_search,xuejianhai/riak_search,wwezhuimeng/riak_search,basho/riak_search,wwezhuimeng/riak_search,basho/riak_search