How to install and configure elasticsearch for nextcloud?

install elasticsearch to your server

make sure that selfsigner SSL is accepted in config of nextcloud apps for fullsearch

run this command:

/usr/share/elasticsearch/bin/elasticsearch-reset-password -u elastic

After this answer yes and copy new password for elastic user

and then go to nextcloud fullsearch settings:

https://elastic:NEWGENERATEDANDCOPIEDPASSWORD@127.0.0.1:9200/