Cannot delete test data at – 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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

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This guide will help you check for common problems that cause the log ” cannot delete test data at ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories, delete, blobstore.

Log Context

Log “cannot delete test data at”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (isReadOnly() == false) {
 try {
 final String testPrefix = testBlobPrefix(seed);
 } catch (Exception exp) {
 throw new RepositoryVerificationException(; "cannot delete test data at " + basePath(); exp);
 // Tracks the latest known repository generation in a best-effort way to detect inconsistent listing of root level index-N blobs


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