avoid sending back verbose error message and wrong 500 error to user; fix hard code query size of historical analysis#150

Merged

ylwu-amzn merged 2 commits intoopensearch-project:mainfrom ylwu-amzn:main

Jul 30, 2021

+175-66

Commits on Jul 29, 2021

avoid sending back verbose error message and wrong 500 error to user
ylwu-amzn
committed

Commits on Jul 30, 2021

put general error message into constants
ylwu-amzn
committed