Failed to send allocate dangled – 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 allocate a dangled index but fails. A dangled index is an index that is not part of the cluster state but has data in the data directory. This can happen due to network issues, node failures, or incorrect configurations. To resolve this, you can try restarting the OpenSearch node, checking network connectivity, or verifying your cluster configurations. If the issue persists, consider manually importing the dangled index or deleting its data if it’s not needed.

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This guide will help you check for common problems that cause the log ” failed to send allocate dangled ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: dangled.

Log Context

Log “failed to send allocate dangled” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

              "failed to send allocated dangled"; e);
        } catch (Exception e) {
            logger.warn("failed to send allocate dangled"; e);

    public void clusterChanged(ClusterChangedEvent event) {


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