Close index request failed to be acknowledged – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration 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 ” close index request failed to be acknowledged ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: request, plugin, index.

Log Context

Log “close index request failed to be acknowledged”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (indexMetadata.getState() == IndexMetadata.State.OPEN) {
 CloseIndexRequest closeIndexRequest = new CloseIndexRequest(followerIndex).masterNodeTimeout(TimeValue.MAX_VALUE);
 getClient().admin().indices().close(closeIndexRequest; ActionListener.wrap(r -> {
 if (r.isAcknowledged() == false) {
 throw new ElasticsearchException("close index request failed to be acknowledged");
 }; listener::onFailure));
 } else {


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