Failed to close ReaderManager – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.4-8.9

Briefly, this error occurs when Elasticsearch is unable to close the ReaderManager, which is responsible for managing open IndexReaders. This could be due to a resource leak, a bug in the software, or a system interruption. To resolve this issue, you can try restarting the Elasticsearch service, ensuring that your system has sufficient resources, or upgrading Elasticsearch to the latest version to fix any potential bugs. If the problem persists, consider checking your system logs for any underlying issues that may be causing this error.

This guide will help you check for common problems that cause the log ” Failed to close ReaderManager ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Failed to close ReaderManager” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                try {
                    IOUtils.close(flushListener; externalReaderManager; internalReaderManager);
                } catch (Exception e) {
                    logger.warn("Failed to close ReaderManager"; e);
                try {
                } catch (Exception e) {
                    logger.warn("Failed to close translog"; e);


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