Failed to send allocated dangled – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

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Briefly, this error occurs when Elasticsearch tries to send a request to a node that is no longer part of the cluster, often due to network issues or node failure. To resolve this, you can try restarting the failed node or the entire cluster. If the problem persists, check your network configuration and ensure that all nodes are properly connected. Additionally, you may need to update your cluster settings to remove the failed node or increase the timeout settings to allow for slower network connections.

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

Log Context

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

                        logger.trace("allocated dangled");

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


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