Failed to write dangling indices state for index %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to write the state of an index that is no longer referenced by the cluster state, also known as a dangling index. This could be due to insufficient disk space, file system issues, or permission problems. To resolve this issue, you can try freeing up disk space, checking the file system for errors, or ensuring that Elasticsearch has the necessary permissions to write to the directory. Additionally, you may want to consider disabling the automatic import of dangling indices if it’s not required for your use case.

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

Log Context

Log “failed to write dangling indices state for index %s” classname is
We extracted the following from Elasticsearch 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(() -> format("failed to write dangling indices state for index %s"; index); e);

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


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