Clarification in docs about max_size for rollover API #37981
Description
In the docs for rollover api it is not clear that max_size refers to the primary store size. While it makes sense when you think about it a bit further (because one of the main uses of rollover API is to limit the size of shards, and the total store size can vary greatly depending on the number of replicas), it would be useful to have this noted explicitly here to avoid confusion.