Error closing IndexInput – 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 encounters an issue while trying to close an IndexInput, which is a stream that reads data from an index. This could be due to a problem with the underlying storage system, a network issue, or a bug in the software. To resolve this issue, you could try restarting the OpenSearch node, checking the health of your storage system, or updating to the latest version of OpenSearch. If the problem persists, consider reaching out to the OpenSearch community or support for further assistance.

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This guide will help you check for common problems that cause the log ” Error closing IndexInput ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “Error closing IndexInput” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                result.whenComplete((indexInput; error) -> {
                    if (indexInput != null) {
                        try {
                        } catch (IOException e) {
                            logger.warn("Error closing IndexInput"; e);


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