Failed to find dangling indices – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 1.7-1.7

Briefly, this error occurs when Elasticsearch tries to recover data from indices that were not properly deleted or indices that are not associated with any cluster, known as dangling indices. This could be due to abrupt shutdowns or crashes. To resolve this issue, you can manually delete the dangling indices if they are not needed. Alternatively, you can set the ‘gateway.auto_import_dangling_indices’ to true in the Elasticsearch configuration file to automatically import these indices. However, be cautious as this could lead to data inconsistency.

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

Log Context

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

                                                             new RemoveDanglingIndex(indexMetaData))));
                    } catch (Throwable e) {
                        logger.warn("failed to find dangling indices"; e);
            if (autoImportDangled.shouldImport() && !danglingIndices.isEmpty()) {
                final List dangled = Lists.newArrayList();


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