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

Opster Team

Aug-23, Version: 7.16-8.2

Briefly, this error occurs when Elasticsearch fails to execute a callback function before a shard is created. This could be due to a plugin malfunction, a network issue, or a problem with the Elasticsearch cluster itself. To resolve this issue, you can try restarting the Elasticsearch node, checking the network connectivity, or disabling the problematic plugin. If the issue persists, consider checking the cluster health and reallocating the shards if necessary.

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

    public void beforeIndexShardCreated(ShardRouting shardRouting; Settings indexSettings) {
        for (IndexEventListener listener : listeners) {
            try {
                listener.beforeIndexShardCreated(shardRouting; indexSettings);
            } catch (Exception e) {
                logger.warn(() -> new ParameterizedMessage("[{}] failed to invoke before shard created callback"; shardRouting); e);
                throw e;


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