Failed to find dangling indices – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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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