Failed to ack index store deleted for index – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch fails to acknowledge the deletion of an index store. This could be due to a network issue, a node failure, or a problem with the underlying storage system. To resolve this issue, you can try restarting the Elasticsearch node, checking the network connectivity, or verifying the health of your storage system. If the problem persists, you may need to manually delete the index and recreate it. Always ensure you have a backup of your data before performing such operations.

This guide will help you check for common problems that cause the log ” [{}] failed to ack index store deleted for index ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, index and node.

Log Context

Log “[{}] failed to ack index store deleted for index” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        threadPool.generic().execute(new AbstractRunnable() {
            public void onFailure(Throwable t) {
                logger.warn("[{}] failed to ack index store deleted for index"; t; index);

            protected void doRun() throws Exception {
                lockIndexAndAck(index; nodes; nodeId; clusterState; indexSettings);


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