Failed to invoke before shard deleted 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 deleting a shard, but fails. This could be due to a variety of reasons such as a network issue, a node failure, or a problem with the callback function itself. To resolve this issue, you could try restarting the Elasticsearch node, checking the network connection, or debugging the callback function to ensure it’s working correctly. If the problem persists, consider checking the Elasticsearch logs for more detailed error information.

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

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


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