Failed to clean index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to delete or clean up an index due to issues like insufficient permissions, disk space shortage, or a locked index. To resolve this, you can check if the Elasticsearch process has the necessary permissions to delete the index. If disk space is the issue, free up some space. If the index is locked, unlock it using the Elasticsearch API. Also, ensure that no process is currently using the index you’re trying to delete.

This guide will help you check for common problems that cause the log ” failed to clean index ({}) ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, index and indices.

Log Context

Log “failed to clean index ({})” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    private void removeIndex(String index; String reason) {
        try {
            indicesService.removeIndex(index; reason);
        } catch (Throwable e) {
            logger.warn("failed to clean index ({})"; e; reason);


    private void deleteIndex(String index; String reason) {


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