Required alias alias does not exist – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.11-8.9

Briefly, this error occurs when an operation is attempted on an alias that does not exist in the Elasticsearch cluster. The alias could have been deleted or not created yet. To resolve this issue, you can either create the missing alias using the ‘Create Alias API’ or modify your operation to use the actual index name instead of the alias. Also, ensure that the alias name is spelled correctly and check for case sensitivity.

This guide will help you check for common problems that cause the log ” required alias [” + alias + “] does not exist ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: alias, metadata, cluster.

Log Context

Log “required alias [” + alias + “] does not exist” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 boolean apply(NewAliasValidator aliasValidator; Metadata.Builder metadata; IndexMetadata index) {
 if (false == index.getAliases().containsKey(alias)) {
 if (mustExist != null && mustExist) {
 throw new ResourceNotFoundException("required alias [" + alias + "] does not exist");
 return false;
 return true;


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