Document delete spike in elastic v7


Recently we are upgrading from Elasticsearch v6 to Elasticsearch v7
we are basically doing the same thing but we see that we have huge spikes in document deleted (unlike v6) and that IOPS are higher 10x
can you pls advise what we should be looking into?
additionally merges spike as well.
does v7 prerequisites changed from v6 (more memory is needed)?

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