Failed to write dangling indices state for index – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to write the state of dangling indices, which are indices that exist on disk but are not part of the cluster state. This could be due to insufficient disk space, file system issues, or permission problems. To resolve this, you can try freeing up disk space, checking the file system for errors, or ensuring OpenSearch has the necessary permissions to write to the directory. Additionally, consider checking the OpenSearch logs for more detailed error messages that could provide further insight into the issue.

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This guide will help you check for common problems that cause the log ” failed to write dangling indices state for index {} ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, indices, dangling.

Log Context

Log “failed to write dangling indices state for index {}” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            final long triggeredTimeMillis = threadPool.relativeTimeInMillis();
            try {
                danglingIndicesThreadPoolExecutor.execute(new AbstractRunnable() {
                    public void onFailure(Exception e) {
                        logger.warn(() -> new ParameterizedMessage("failed to write dangling indices state for index {}"; index); e);

                    protected void doRun() {
                        final boolean exists = danglingIndicesToWrite.remove(index);


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