Flush API: remove refresh flag
Refresh flag in flush is problematic, since the shards refresh is allowed to execute on is different compared to the flush shards. In order to do flush and then refresh, they should be executed as separate APIs when needed.
closes #3689
Optimize API: Remove refresh flag
Refresh flag in optimize is problematic, since the shards refresh is allowed to execute on is different compared to the optimize shards. In order to do optimize and then refresh, they should be executed as separate APIs when needed.
closes #3690
use built in flush/refresh helper methods
better logging
trace log the low level details on recovery