Commits on Jun 18, 2018

1. Skip get_alias tests for 5.x …

   Some recent failures on the mixed cluster tests were caused by elastic#31308.
   Instead of executing get index API when calling GET /_alias we now go
   through the get alias API. The behaviour of such API is slightly
   different on 5.6 compared to 6.x and master as to whether indices that
   have no aliases are returned or not. In fact elastic#25114 was not backported
   to 5.6.
   
   When the 5.6 node is the elected master, if the get alias API goes
   through such node or another 5.x node, the get index API will be used
   internally and all tests are fine. If some 6.x node is hit though by the
   client request, we will go through the get alias API, but we will do it
   through the elected master which will not return indices without aliases
   (at transport, see MetaData#findAliases on 5.6). That means that in a
   mixed cluster this API will return a different result depending on which
   node is the elected master and which one is hit by the request.

   

   javanna committed Jun 18, 2018
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