elasticsearch/elasticsearch — pull request #8496 by s1monw (2014-11-17 08:47:54+00:00)
Title: [BWC] BWC layer for GetIndex should not block in a listener

Today we execute BWC calls against nodes that have not GetIndex API
in a action listeners #onFailure method. These calls are blocking today
and might be executed on a bounded thread-pool which might deadlock the
call depending on how many threads are in the pool and how the pool is
setup. These calls should run async as well.