PostIndex listener listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when the PostIndex listener, a component that performs actions after indexing, encounters an issue. This could be due to a variety of reasons such as incorrect configurations, network issues, or resource limitations. To resolve this, you can check the Elasticsearch logs for more detailed error messages. Ensure that your configurations are correct and that the Elasticsearch cluster has sufficient resources. If it’s a network issue, verify the connectivity between the nodes. Also, consider upgrading Elasticsearch if you’re using an outdated version, as this could be a bug that’s been fixed in newer versions.

This guide will help you check for common problems that cause the log ” postIndex listener [” + listener + “] failed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, shard.

Log Context

Log “postIndex listener [” + listener + “] failed” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            assert index != null;
            for (IndexingOperationListener listener : listeners) {
                try {
                    listener.postIndex(shardId; index; result);
                } catch (Exception e) {
                    logger.warn(() -> "postIndex listener [" + listener + "] failed"; e);



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