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Briefly, this error occurs when the “to” field in the email section of a Watcher action or Alerting action is missing. Elasticsearch requires this field to know where to send the email. To resolve this issue, you can either add the “to” field with a valid email address in the action configuration or, if you’re using a default email, ensure it’s correctly set up in the Elasticsearch settings. Also, check for any syntax errors in your configuration that might be causing the “to” field to be overlooked.
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This guide will help you check for common problems that cause the log ” missing required email [to] field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “missing required email [to] field” class name is Account.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
// applying the defaults on missing emails fields
email = config.defaults.apply(email); if (email.to == null) {
throw new SettingsException("missing required email [to] field");
} Transport transport = session.getTransport(SMTP_PROTOCOL); String user = auth != null ? auth.user() : config.smtp.user;
