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

Opster Team

Aug-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch is unable to execute a callback function after a change in the state of an index shard. This could be due to a variety of reasons such as network issues, insufficient resources, or a bug in the Elasticsearch code. To resolve this issue, you can try restarting the Elasticsearch node, increasing system resources, or updating Elasticsearch to the latest version. If the problem persists, you may need to check your cluster health and ensure that all nodes are functioning properly.

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 Elasticsearch concepts: index, shard.

Log Context

Log “[{}] failed to invoke index shard state changed callback” classname is
We extracted the following from Elasticsearch 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;


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