Can not be imported as a dangling index as there is already another index – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch tries to import an index that has been identified as a “dangling index” but there’s already an existing index with the same name. Dangling indices are indices that are not part of any cluster state but have data in the data directory. To resolve this, you can either delete the existing index if it’s no longer needed, or rename the dangling index before importing it. Alternatively, you can also change the OpenSearch settings to allow the import of dangling indices even if an index with the same name exists.

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This guide will help you check for common problems that cause the log ” [{}] can not be imported as a dangling index; as there is already another index ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: dangling, index.

Log Context

Log “[{}] can not be imported as a dangling index; as there is already another index” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

    void cleanupAllocatedDangledIndices(Metadata metadata) {
        for (Index index : danglingIndices.keySet()) {
            final IndexMetadata indexMetadata = metadata.index(index);
            if (indexMetadata != null && indexMetadata.getIndex().getName().equals(index.getName())) {
                if (indexMetadata.getIndex().getUUID().equals(index.getUUID()) == false) {
                    logger.warn("[{}] can not be imported as a dangling index; as there is already another index " +
                        "with the same name but a different uuid. local index will be ignored (but not deleted)"; index);
                } else {
                    logger.debug("[{}] no longer dangling (created); removing from dangling list"; index);


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