ES responding very slow after Rolling Restart

I have just restart my elasticsearch cluster only data-nodes increase the number of Core after the restart ES is responding very slow

The query is taking almost around 3K ms while it uses to take 300ms at max

Did we miss something?
Is there something else that needs to do?
or it will recover with time, it has been 30 mins since the restart and it has not recovered yet

ES Version 6.5.4
11 nodes in the cluster having 5 data nodes

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