Commits on Mar 17, 2016

1. Prevent index level setting from being configured on a node level …

   Today we allow to set all kinds of index level settings on the node level which
   is error prone and difficult to get right in a consistent manner.
   For instance if some analyzers are setup in a yaml config file some nodes might
   not have these analyzers and then index creation fails.
   
   Nevertheless, this change allows some selected settings to be specified on a node level
   for instance:
    * `index.codec` which is used in a hot/cold node architecture and it's value is really per node or per index
    * `index.store.fs.fs_lock` which is also dependent on the filesystem a node uses
   
   All other index level setting must be specified on the index level. For existing clusters the index must be closed
   and all settings must be updated via the API on each of the indices.
   
   Closes elastic#16799

   

   s1monw committed Mar 17, 2016
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