Failed to delete unassigned index reason – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch attempts to delete an index that is unassigned but fails due to issues like insufficient permissions, disk space, or network connectivity. To resolve this, you can try the following: 1) Check and adjust the user permissions to ensure Elasticsearch has the necessary rights to delete indices. 2) Verify that there is enough disk space available. 3) Check the network connectivity between the Elasticsearch nodes. 4) If the index is corrupted, you may need to manually delete the index files from the data directory.

This guide will help you check for common problems that cause the log ” [{}] failed to delete unassigned index (reason [{}]) ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: delete, index, indices.

Log Context

Log “[{}] failed to delete unassigned index (reason [{}])” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                        "of the cluster state [" + currentMetadata.getIndexUUID() + "] [" +
                        oldIndexMetadata.getIndexUUID() + "]");
                deleteIndexStore(reason; oldIndexMetadata);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("[{}] failed to delete unassigned index (reason [{}])";
                    oldIndexMetadata.getIndex(); reason); e);


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