Host host is not whitelisted in setting – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-7.15

Briefly, this error occurs when the Elasticsearch node you’re trying to connect to is not included in the list of allowed hosts (whitelist) in the Elasticsearch settings. This is a security measure to prevent unauthorized access. To resolve this issue, you can either add the host to the whitelist in the Elasticsearch settings or disable the whitelist check if it’s not needed. However, disabling the whitelist check might expose your Elasticsearch to potential security risks. Always ensure that your Elasticsearch is properly secured.

This guide will help you check for common problems that cause the log ” host [” + host + “] is not whitelisted in setting [ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “host [” + host + “] is not whitelisted in setting [” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 HttpContext context) throws ProtocolException {
 boolean isRedirected = super.isRedirected(request; response; context);
 if (isRedirected) {
 String host = response.getHeaders("Location")[0].getValue();
 if (isWhitelisted(host) == false) {
 throw new ElasticsearchException("host [" + host + "] is not whitelisted in setting [" +
 HttpSettings.HOSTS_WHITELIST.getKey() + "]; will not redirect");
 }  return isRedirected;