David Turner 6885a7cb0f
Introduce transport API for cluster bootstrapping (#34961)
- Introduces a transport API for bootstrapping a Zen2 cluster
- Introduces a transport API for requesting the set of nodes that a
  master-eligible node has discovered and for waiting until this comprises the
  expected number of nodes.
- Alters ESIntegTestCase to use these APIs when forming a cluster, rather than
  injecting the initial configuration directly.
2018-11-08 16:09:37 +00:00
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