On Riak 2.0.7, working correctly:
(riak@xxxxxxxxxx)18> {ok,Dataroot} = application:get_env(bitcask,data_root).
{ok,"/var/lib/riak/bitcask"}
(riak@xxxxxxxxxx)19> [{Idx, bitcask:merge(filename:join(Dataroot,integer_to_list(Idx)))} ||
{Idx,_Pid} <- riak_core_vnode_manager:all_index_pid(riak_kv_vnode)].
```
```
[{1027618338748291114361965898003636498195577569280,ok},
{1324485858831130769622089379649131486563188867072,ok},
```
Please close this ticket.