FYI : How to download data in CSV from Kibana:
In Kibana--> 1. Go to 'Discover' in left side
Select Index Field (based on your dashboard data) (*** In case if you are not sure which index to select-->go to management tab-->Saved Objects-->Dashboard-->select dashboard name-->scroll down to JSON-->you will see the Index name )
left side you see all the variables available in the data-->click over the variable name that you want to have in csv-->click add-->this variable will be added on the right side of the columns avaliable
Top right section of the kibana-->there is the time filter-->click -->select the duration for which you want the csv
Top upper right -->Reporting-->save this time/variable selection with a new report-->click generate CSV
Go to 'Management' in left side--> 'Reporting'-->download your csv