Index size increased after reindexing

Elastic Stack Elasticsearch
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1

After the completion of reindex process,the size of new index is very big compare to original index.Although i force_merge the index nothing happened.
Original index size was 101.7gb and new index is 140gb around.We've change the mapping in index template.It could be the reason of high index size

2

It's possible the mapping is the reason for that, yes.

3

Thanks @warkolm

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