THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!

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All nodes join live_nodes, as is the case today
ZK structure for roles:
- - /node_roles
    - overseer
      znode data: { .. /* some configs for overseer role */ ..}
      - solr1_8983 (ephemeral node)
      - solr2_8983 (ephemeral node)
      - solr3_8983 (ephemeral node)
    - data
      znode data: { .. /* some configs for data role */ ..}
      - solr4_8983 (ephemeral node)
      - solr5_8983 (ephemeral node)
      - solr6_8983 (ephemeral node)
      - solr7_8983 (ephemeral node)
      - ...
    - coordinator (example of a future role)
      znode data: {.. /* configs.. */}
      - solrcoord1_8983 (ephemeral node)
      - ...

Roles During Application Lifecycle:

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