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
      - preferred
        nodes
        solr1_8983 (ephemeral node)
        [zdata: {"mode": "preferred"}]
        
        solr2_8983 (ephemeral node)
        [zdata: {"mode": "preferred"}]
      - allowed
        nodes
        solr3_8983 (ephemeral node)
        [zdata: {"mode": "preferred"}]
      data
      - disallowed
        nodes
        solr4_8983 (ephemeral node)
        solr5_8983 (ephemeral node)
        solrcoord1_8983 (ephemeral node)
    - data
      - on
        nodes
        solr4_8983 (ephemeral node)
        [zdata: {"mode": "on"}]
        
        solr5_8983 (ephemeral node)
        [zdata: {"mode": "on"}] solr6
        
        off
        nodes
        solr1_8983 (ephemeral node)
        solr2_8983 (ephemeral node)
        [zdata: {"mode": "on"}]
        solr3
        solr7
        _8983 (ephemeral node)
        [zdata: {"mode": "on"}]...
        solrcoord1_8983 (ephemeral node)
      - coordinator (example of a future role)
        on
        nodes
        solrcoord1_8983 (ephemeral node)
        off
        nodes
        solr1_8983 (ephemeral node)
        solr2_8983 (ephemeral node)
        solr3_8983 (ephemeral node)
        solr4_8983 (ephemeral node)
        [zdata: {"mode": "on"}]...
        solr5_8983 (ephemeral node)
Roles During Application Lifecycle:
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