No bucket defined for s3 repository – 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 Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” No bucket defined for s3 repository ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, repository-s3, repository and plugins.

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 “No bucket defined for s3 repository”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

this.service = service; 
 // Parse and validate the user's S3 Storage Class setting
 this.bucket = BUCKET_SETTING.get(metadata.settings());
 if (bucket == null) {
 throw new RepositoryException(; "No bucket defined for s3 repository");
 this.bufferSize = BUFFER_SIZE_SETTING.get(metadata.settings());
 this.chunkSize = CHUNK_SIZE_SETTING.get(metadata.settings());


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