With this feature, a Historical node can be put in maintenance mode, by adding it to `maintenanceList` in Druid Coordinator dynamic config. Coordinator will move segments from such nodes with a specified priority `maintenanceModeSegmentsPriority`. That allows to move segments from nodes which will be replaced afterwards avoiding availability issues which could be caused by abrupt shutdown. Issue https://github.com/apache/incubator-druid/issues/3247
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