I'm quite sure that then it helps to update empty DM quicker than looking through all indexes. Also can also update times for looking updates into it and one optimization could be to update update frequency, but as you haven't data and just add individual empty index there those are not needed to get DM updated enough quickly. You should also check from MC that you haven't any skipped searches due to this DM update. MC -> Search -> Scheduler (or something similar, couldn't remember those exact names)
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