Ali Beyad 5189eb41c7 Dangling indices are not imported if a tombstone for the same index
(same name and UUID) exists in the cluster state.  This resolves a
situation where if an index data folder was copied into a node's data
directory while the node is running and that index had a tombstone in
the cluster state, the index would still get imported.

Closes #18250
Closes #18249
2016-05-11 12:56:19 -04:00
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