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• Every role also has a list of modes under which a node can be. For certain roles (e.g. overseer) it is useful for potentially finer grained control of how strictly or loosely that role applies for that node.
• Most roles would just have two modes (on, off)
• In special cases a role might have more modes, e.g. "overseer" role to have (allowed, disallowed, preferred) modes.
• For every role, one of the modes is defaultIfAbsent, i.e. a node that doesn't specify that role, the mode that is assumed for the functionality for that role. For example, if a node starts with "-Dsolr.node.roles=data:on", then it will be assumed that the node has overseer has mode "disallowed" (i.e. the defaultIfAbsent mode of the overseer role).

The following roles are proposed (based on existing functionality):

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Sample output:
{
"overseer": {modes: ["preferred", "allowed", "disallowed"], "defaultIfAbsent": "disallowed"},
"data": {"modes": ["on", "off"], "defaultIfAbsent": "off"}
}

Description: Which roles (and their corresponding modes) do this current Solr cluster support?

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