An index or data stream exists with the same name as the alias – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

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

This guide will help you check for common problems that cause the log ” an index or data stream exists with the same name as the alias ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, metadata, index, alias.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “an index or data stream exists with the same name as the alias”classname  is AliasValidator.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

throw new IllegalArgumentException("index name is required");
 } 
 String sameNameAsAlias = lookup.apply(alias);
 if (sameNameAsAlias != null) {
 throw new InvalidAliasNameException(alias; "an index or data stream exists with the same name as the alias");
 }
 } 
 static void validateAliasStandalone(String alias; String indexRouting) {
 if (Strings.hasText(alias) == false) {

 

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