PostIndex listener failed – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch encounters an issue while executing a post-index operation. This could be due to a variety of reasons such as a network issue, a problem with the listener itself, or a bug in the Elasticsearch code. To resolve this issue, you can try restarting Elasticsearch, checking the network connection, or updating Elasticsearch to the latest version. If the problem persists, you may need to debug the listener to identify the root cause of the issue.

This guide will help you check for common problems that cause the log ” postIndex 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 [{}] 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(() -> new ParameterizedMessage("postIndex listener [{}] failed"; listener); e);



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