Elasticsearch versions before 7.10.0 and 6.8.14 have an information disclosure issue when audit logging and the emit_request_body option is enabled. The Elasticsearch audit log could contain sensitive information such as password hashes or authentication tokens. This could allow an Elasticsearch administrator to view these details.
https://security.netapp.com/advisory/ntap-20210319-0003/
https://discuss.elastic.co/t/elastic-stack-7-11-0-and-6-8-14-security-update/263915