Failed to delete 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 tries to delete the state of an index that no longer exists, also known as a dangling index. This could be due to a network partition, node failure, or a manual deletion of index files. To resolve this issue, you can try restarting the OpenSearch node, ensuring that the cluster state is stable and all nodes are properly connected. If the problem persists, you may need to manually delete the dangling index state from the data directory of the affected node.

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

Log Context

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

        try {
        } catch (IOException e) {
            logger.warn(() -> new ParameterizedMessage("failed to delete dangling indices state for index {}"; index()); e);

    public String indexUUID() {
        return indexSettings.getUUID();


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