elasticsearch/elasticsearch — pull request #8245 by s1monw (2014-10-27 16:09:01+00:00)
Title: [ENGINE] Add current translog ID to commit meta before closing

Today we simply close the IW when we have to open a new one if ie.
we change merge settings. Yet, the API is deprecated and under the hood
it commits the IW. For safety we should add the current translog ID and
use rollback instead to not wait for merges.