Failed to invoke before shard closed callback – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch tries to execute a callback function before closing a shard, but fails due to an unexpected issue. This could be due to a variety of reasons such as a bug in the code, a network issue, or a resource constraint. To resolve this issue, you could try restarting the Elasticsearch node, checking for any bugs in the code, or increasing the resources allocated to Elasticsearch if it’s a resource issue. If the problem persists, consider checking the Elasticsearch logs for more detailed error messages.

This guide will help you check for common problems that cause the log ” [{}] failed to invoke before shard closed 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 before shard closed callback” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

    public void beforeIndexShardClosed(ShardId shardId; @Nullable IndexShard indexShard; Settings indexSettings) {
        for (IndexEventListener listener : listeners) {
            try {
                listener.beforeIndexShardClosed(shardId; indexShard; indexSettings);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("[{}] failed to invoke before shard closed callback"; shardId.getId()); e);
                throw e;


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