What will rollover api do if max rolling numbers are reached? -000001 to -999999
you can see the relevant code snippet here https://github.com/elastic/elasticsearch/blob/master/server/src/main/java/org/elasticsearch/action/admin/indices/rollover/TransportRolloverAction.java#L184-L198
However this discussion is rather artifical, as having a million indices is the bigger problem when this happens. You will have a bad time before that already.
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