Thank you for your respond!
I have set elasticsearch.requestTimeout and elasticsearch.shardTimeout to 90000 and the result is successful to show all visualizations from 2 months ago 
Futhermore I'm trying to show all visualizations from 3 months ago and the result is [esaggs] > JSON.parse: unexpected character at line 1 column 1 of the JSON data again, even though I have set elasticsearch.requestTimeout and elasticsearch.shardTimeout to 300000 
Is this my server limits due to its specification?
Is there a way to turn off the timeout feature and make kibana wait for all visualizations process finish? I don't mind if the visualization process take half an hour or more..