Elastic security throwing "Authentication to realm default_native failed - Password authentication failed for <user>"

Elastic Stack Elasticsearch
1

Hi Team,

I have es cluster with the below version

 |version||
   |---|---|
   |number|"7.8.1"|
   |build_flavor|"default"|
   |build_type|"rpm"|
   |build_hash|"b5ca9c58fb664ca8bf9e4057fc229b3396bf3a89"|
   |build_date|"2020-07-21T16:40:44.668009Z"|
   |build_snapshot|false|
   |lucene_version|"8.5.1"|
   |minimum_wire_compatibility_version|"6.8.0"|
   |minimum_index_compatibility_version|"6.0.0-beta1"|
   |tagline|"You Know, for Search"|

Enabled the security with the following properties

xpack.security.enabled: true
xpack.security.transport.ssl.enabled: true
xpack.security.transport.ssl.verification_mode: certificate
xpack.security.transport.ssl.key: config/certs/server.key
xpack.security.transport.ssl.certificate: config/certs/server.crt
xpack.security.transport.ssl.certificate_authorities: [ "config/certs/ca.crt" ]
xpack.security.http.ssl.enabled: true
xpack.security.http.ssl.key: config/certs/server.key
xpack.security.http.ssl.certificate: config/certs/server.crt
xpack.security.http.ssl.certificate_authorities: [ "config/certs/ca.crt" ]

Error

org.elasticsearch.ElasticsearchStatusException: Elasticsearch exception [type=security_exception, reason=unable to authenticate user [] for REST request [/t?master_timeout=30s&ignore_unavailable=false&expand_wildcards=open%2Cclosed&allow_no_indices=true&ignore_throttled=false&timeout=2m]]


[2021-01-28T06:12:02,947][WARN ][o.e.x.s.a.AuthenticationService] [app01infradep1.mcps.cxindustry02phx.oraclevcn.com] Authentication to realm default_native failed - Password authentication failed for oudp_idgraphbuilder```

what config I am missing here ?
2

Does that user exist? Can you use curl to talk to Elasticsearch with it with it's authentication details?