Unable to clean store after reader closed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.7-2.9

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Briefly, this error occurs when OpenSearch fails to delete temporary files after a reader has been closed. This could be due to insufficient permissions, a full disk, or a file lock issue. To resolve this, you can try freeing up disk space, checking and adjusting file and directory permissions, or identifying and resolving any file lock issues. If the problem persists, consider restarting the OpenSearch service or the server itself.

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This guide will help you check for common problems that cause the log ” Unable to clean store after reader closed ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Unable to clean store after reader closed” classname is Store.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            try {
                this.cleanupAndPreserveLatestCommitPoint(files; "On reader close");
            } catch (IOException e) {
                // Log but do not rethrow - we can try cleaning up again after next replication cycle.
                // If that were to fail; the shard will as well.
                logger.error("Unable to clean store after reader closed"; e);


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