I Appreciate it @Diana_Huang.
@feanil, do we know exactly which apps are using elastic right now and where are the indexes in each app?
as far as I know, these apps are using it:
cs_comments_service https://github.com/openedx/cs_comments_service
blockstore https://github.com/openedx/blockstore
edx-search (courseware search) https://github.com/openedx/edx-search
and as they said using elastic will be removed in the apps below in the future:
course-discovery, edx-notes, edx-analytics-api