@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        FleetControllerId that = (FleetControllerId) o;
        return index == that.index && Objects.equals(clusterName, that.clusterName);
    }
Uniquely identifies a running FleetController: cluster name + index.

@author hakon
clustercontroller-core/src/main/java/com/yahoo/vespa/clustercontroller/core/FleetControllerId.java