Deleting dangling index – 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 ” Deleting dangling index ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: dangling and index.

Log Context

Log “[{}] deleting dangling index” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 DanglingIndex remove = danglingIndices.remove(metaData.index());
                // no longer there...
                if (remove == null) {
                logger.warn("[{}] deleting dangling index"; metaData.index());
                try {
                    indicesService.deleteIndexStore("deleting dangling index"; metaData; clusterService.state());
                } catch (Exception ex) {
                    logger.debug("failed to delete dangling index"; ex);


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