Elasticsearch installation with xpack fails - linux

Question

I am installing Elasticsearch 6.6 with Xpack and it is failing on "nativeUser" issue:
failed: [elasticsearch1] (item=nativeUser) => {
"changed": false,
"content": "",
"invocation": {
"module_args": {
"attributes": null,
"backup": null,
"body": "{\"password\": \"<****>\", \"roles\": [\"power_user\", \"user\"]}",
"body_format": "json",
"client_cert": "",
"client_key": "",
"content": null,
"creates": null,
"delimiter": null,
"dest": null,
"directory_mode": null,
"follow": false,
"follow_redirects": "safe",
"force": false,
"force_basic_auth": true,
"group": null,
"headers": {
"Content-Type": "application/json"
},
"http_agent": "ansible-httpget",
"method": "POST",
"mode": null,
"owner": null,
"password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
"regexp": null,
"remote_src": null,
"removes": null,
"return_content": false,
"selevel": null,
"serole": null,
"setype": null,
"seuser": null,
"src": null,
"status_code": [
"200"
],
"timeout": 30,
"unsafe_writes": null,
"url": "https://<hostname1>:9201/_xpack/security/user/nativeUser",
"url_password": "VALUE_SPECIFIED_IN_NO_LOG_PARAMETER",
"url_username": "es_admin",
"use_proxy": true,
"user": "es_admin",
"validate_certs": false
}
},
"item": "nativeUser",
"msg": "Status code was -1 and not [200]: Connection failure: ('The read operation timed out',)",
"redirected": false,
"status": -1,
"url": "https://<hostname1>:9201/_xpack/security/user/nativeUser"
}
I do not understand what is "nativeUser" and how this error can be fixed?
I ran the url with curl and got the following error:
curl -u es_admin:changeMe -X POST "https://illin7040:9201/_xpack/security/user/nativeUser?pretty" -H 'Content-Type: application/json' -d' { "password" : "changeMe", "roles" : [ "admin", "power_user", "user" ], "full_name" : "nativeUser", "email" : null, "metadata" : {"reserved":true},"enabled":true}}' -k
{
"error" : {
"root_cause" : [
{
"type" : "master_not_discovered_exception",
"reason" : null
}
],
"type" : "master_not_discovered_exception",
"reason" : null
},
"status" : 503
}
All the three nodes in my env are configured as master..
I am new to Ansible and Elasticsearch, any advice would be appreciated. Thanks.