Ignoring dangled index on node – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

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Briefly, this error occurs when OpenSearch encounters an index that is not associated with any cluster state. This is known as a “dangled” index. It can happen due to issues like abrupt shutdowns, data corruption, or network partitions. To resolve this, you can manually import the dangled index if it contains important data. Alternatively, you can delete the dangled index if it’s not needed. Also, ensure that your OpenSearch cluster is properly configured and maintained to prevent such issues in the future.

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This guide will help you check for common problems that cause the log ” ignoring dangled index [{}] on node [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: node, dangled, index.

Log Context

Log “ignoring dangled index [{}] on node [{}]” classname is LocalAllocateDangledIndices.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    boolean importNeeded = false;
                    StringBuilder sb = new StringBuilder();
                    for (IndexMetadata indexMetadata : request.indices) {
                        if (indexMetadata.getCreationVersion().before(minIndexCompatibilityVersion)) {
                            logger.warn("ignoring dangled index [{}] on node [{}]" +
                                " since it's created version [{}] is not supported by at least one node in the cluster minVersion [{}]";
                                indexMetadata.getIndex(); request.fromNode; indexMetadata.getCreationVersion();


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