How to resolve ‘530 5.7.0 Must issue a STARTTLS command first. o63-v6sm4041934ywc.36 - gsmtp\n’ for elasticsearch?

I am creating an application where I need to send an email alert for my logs.
Here is input to create a watcher:

PUT _xpack/watcher/watch/log_error_watch
{
"trigger" : {
"schedule" : { "interval" : "10s" }
},
"input" : {
"search" : {
"request" : {
"indices" : [ "testindexv4" ],
"body" : {
"query" : {
"match" : { "log_level": "ERROR" }
}
}
}
}
}
,
"actions" : {
"send_email" : {
"email" : {
"to" : "<mailId>@gmail.com",
"subject" : "Watcher Notification",
"body" : "error logs found"
}
}
}
}

Here is configuration for elasticsearch.yml

xpack.security.enabled: false
xpack.notification.email.account:
standard_account:
profile: standard
smtp:
auth: false
starttls.enable: false
starttls.required: false
host: smtp.gmail.com
port: 587

When I try to run my watcher, I get the error as:

`reason": "530 5.7.0 Must issue a STARTTLS command first. o63-v6sm4041934ywc.36 - gsmtp\n`

any solution on the same please?

It's solved now, all I need to do is enable TLS authentication.

Here is my updated content of **elasticsearch.yml**:

xpack.security.enabled: false
xpack.notification.email.account:
standard_account:
profile: standard
smtp:
auth: true
starttls.enable: true
starttls.required: true
host: smtp.gmail.com
port: 587
user: <mailId>
password: <passowrd>