Failed to complete pending deletion 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 delete an index that was previously marked for deletion. This could be due to insufficient permissions, a locked index, or a network issue. To resolve this, you can try the following: 1) Ensure that OpenSearch has the necessary permissions to delete indices. 2) Check if the index is locked and unlock it if necessary. 3) Investigate for any network issues that might be preventing the deletion. 4) If the issue persists, consider restarting the OpenSearch cluster.

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

Log Context

Log “[{}] failed to complete pending deletion for index” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            if (indexSettings != null) {
                threadPool.generic().execute(new AbstractRunnable() {
                    public void onFailure(Exception e) {
                        logger.warn(() -> new ParameterizedMessage("[{}] failed to complete pending deletion for index"; index); e);

                    protected void doRun() throws Exception {
                        try {


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