Index store size increased by 4X on new index created using slipt api

We had one index with 1 shard/1 replica config. As per /_cat/indices, it shows
docs.count =133213

now we used split api to create new index with 40 shards.

    POST /oldIndex/_split/newIndex 
      "settings": {
        "index.number_of_shards": 40

Now newIndex created with 40 shards and came to green status also. And now /_cat/indices shows
docs.count =133213

How is this possible? How can store size grow so big?

Did you also run a force merge after?

No, we didn't run force merge. Is it required after using split api?

It's not required but will help IMO. That's at least what I have seen myself recently.

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