Missing required email to field – How to solve this Elasticsearch error

Missing required email to field – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” missing required email to field ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”missing required email [to] field”classname  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;


Run the Check-Up to get a customized report like this:

Analyze your cluster