Exception while closing – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.3

Briefly, this error occurs when Elasticsearch encounters an issue while trying to close a resource, such as a file or a network connection. This could be due to a variety of reasons such as insufficient permissions, network issues, or the resource being already closed. To resolve this issue, you can check the system’s permissions, ensure the network connection is stable, and verify that the resource is open before attempting to close it. Additionally, check the Elasticsearch logs for more detailed information about the error.

This guide will help you check for common problems that cause the log ” Exception while closing [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: recovery, indices.

Log Context

Log “Exception while closing [{}]” classname is RecoverySourceHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        threadPool.generic().execute(() -> {
            try {
            } catch (Exception e) {
                assert false : e;
                logger.warn(new ParameterizedMessage("Exception while closing [{}]"; closeable); e);

    static final class SendFileResult {


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