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

Opster Team

August-23, Version: 7.14-8.9

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Briefly, this error occurs when an Elasticsearch alias is being created or updated with a name that already exists as an index or data stream. This is not allowed as it can cause confusion and data inconsistency. To resolve this issue, you can either rename the alias, or delete the existing index or data stream with the conflicting name. However, be careful with deletion as it will permanently remove all data associated with that index or data stream. Alternatively, you can rename the existing index or data stream to avoid the conflict.

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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: index, alias, metadata, cluster.

Log Context

Log “an index or data stream exists with the same name as the alias” class name is 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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