%s failed to delete unassigned index reason %s – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch fails to delete an unassigned index due to reasons such as insufficient permissions, disk space issues, or network connectivity problems. To resolve this, you can try the following: 1) Check and adjust the user permissions to ensure that the Elasticsearch has the necessary rights to delete the index. 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 it from the file system.

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

Log Context

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

                            + "]"
                deleteIndexStore(reason; oldIndexMetadata);
            } catch (Exception e) {
                logger.warn(() -> format("[%s] failed to delete unassigned index (reason [%s])"; oldIndexMetadata.getIndex(); reason); e);



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