Commits on May 21, 2018

1. [ML] Don't install empty ML metadata on startup …

   This change is to support rolling upgrade from a pre-6.3 default
   distribution (i.e. without X-Pack) to a 6.3+ default distribution
   (i.e. with X-Pack).
   
   The ML metadata is no longer eagerly added to the cluster state
   as soon as the master node has X-Pack available.  Instead, it
   is added when the first ML job is created.
   
   As a result all methods that get the ML metadata need to be able
   to handle the situation where there is no ML metadata in the
   current cluster state.  They do this by behaving as though an
   empty ML metadata was present.  This logic is encapsulated by
   always asking for the current ML metadata using a static method
   on the MlMetadata class.
   
   Relates elastic#30731

   

   droberts195 committed May 21, 2018
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