Failed to invoke index shard state changed callback – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.1

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your OpenSearch operation.

Briefly, this error occurs when OpenSearch fails to execute a callback function after a change in the index shard state. This could be due to a variety of reasons such as network issues, insufficient resources, or a bug in the system. To resolve this issue, you can try restarting the OpenSearch node, checking for network connectivity issues, ensuring there are sufficient resources for the operation, or updating to the latest version of OpenSearch to fix any potential bugs.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” [{}] failed to invoke index shard state changed callback ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: shard, index.

Log Context

Log “[{}] failed to invoke index shard state changed callback” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                                       @Nullable String reason) {
        for (IndexEventListener listener : listeners) {
            try {
                listener.indexShardStateChanged(indexShard; previousState; indexShard.state(); reason);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("[{}] failed to invoke index shard state changed callback";
                    indexShard.shardId().getId()); e);
                throw e;


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?

Get expert answers on Elasticsearch/OpenSearch