elasticsearch/elasticsearch — pull request #8168 by martijnvg (2014-10-20 14:57:45+00:00)
Title: Core: in fixed bitset service fix order where the warmer listener is added.

Add warmer listener only when index service is set, in order to prevent possible NPE.

The IndicesWarmer gets set before the InternalIndexService gets set, which can lead to a small time window were InternalIndexService isn't set