Failed to delete unreferenced translog files – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

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Briefly, this error occurs when Elasticsearch is unable to delete translog files that are no longer referenced due to issues like insufficient permissions, disk space, or a file system error. To resolve this, you can try the following: 1) Check and adjust the permissions of the Elasticsearch directories to ensure the process can modify files. 2) Free up disk space if it’s running low. 3) Check for file system errors and fix them if any. 4) Restart the Elasticsearch node to clear any temporary issues. Always ensure to backup your data before making any changes.

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This guide will help you check for common problems that cause the log ” failed to delete unreferenced translog files ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: delete and index.

Log Context

Log “failed to delete unreferenced translog files” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            } catch (IOException e) {
                logger.warn("failed to delete unreferenced translog files"; e);



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