Commits on Jan 6, 2015

1. [ALLOCATION] Remove primary balance factor …

   The `cluster.routing.allocation.balance.primary` setting has caused
   a lot of confusion in the past while it has very little benefit form a
   shard allocatioon point of view. Users tend to modify this value to
   evently distribute primaries across the nodes which is dangerous since
   a prmiary flag on it's own can trigger relocations. The primary flag for a shard
   is should not have any impact on cluster performance unless the high level feature
   suffereing from primary hotspots is buggy. Yet, this setting was intended to be a
   tie-breaker which is not necessary anymore since the algorithm is deterministic.
   
   This commit removes this setting entriely.

   

   s1monw committed Jan 6, 2015
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