Auto importing dangled indices from – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch detects indices that are not associated with any cluster, known as “dangled” indices. This can happen due to a cluster restart or a node rejoining the cluster. To resolve this, you can manually import the dangled indices using the import_dangling_indices API. Alternatively, you can set the “gateway.auto_import_dangling_indices” to true to automatically import them. However, be cautious as this could lead to data inconsistency. If the indices are not needed, they can be deleted to prevent this error.

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

Log Context

Log “auto importing dangled indices {} from [{}]” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    if (!importNeeded) {
                        return currentState;
          "auto importing dangled indices {} from [{}]"; sb.toString(); request.fromNode);

                    RoutingTable routingTable =;
                    ClusterState updatedState = ClusterState.builder(currentState)


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