follow tutorial on : https://docs.search-guard.com/latest/first-steps-user-configuration to manage /add /remove /change users
edit sg_internalusers.yml and set hash keys for the desired users :
/usr/share/elasticsearch/plugins/search-guard/hash.sh -p <password-in-cleartext>
/usr/share/kibana/bin/kibana-keystore create
/usr/share/kibana/bin/kibana-keystore add elasticsearch.username
/usr/share/kibana/bin/kibana-keystore add elasticsearch.password
verify keystore by :
/usr/share/kibana/bin/kibana-keystore list