Well, I would not do index-time extraction. Perhaps a search-time regex extraction, but it's difficult to say without measurement whether it will be better than auto-kv. Theoretically, increasing this from 10,240 to 102,400 increases the amount of CPU usage by 10x (assuming an O(n) operation). Practically, this may only mean a handful of nanoseconds. One advantage to regex versus auto-kv is that you can limit the regex scope to particular sourcetypes. Raising the kv limit affects processing for every event. Best advice is "measure and compare".
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