PreIndex listener failed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when a pre-index operation listener fails to execute properly. This could be due to a variety of reasons such as incorrect configurations, insufficient resources, or a bug in the listener code. To resolve this issue, you can try the following: 1) Check and correct the configurations related to the listener. 2) Ensure that the system has enough resources (CPU, memory, disk space) to execute the listener. 3) Review the listener code for any bugs or errors and fix them. 4) Restart the OpenSearch service to clear any temporary issues.

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

Log Context

Log “preIndex listener [{}] failed” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            assert operation != null;
            for (IndexingOperationListener listener : listeners) {
                try {
                    listener.preIndex(shardId; operation);
                } catch (Exception e) {
                    logger.warn(() -> new ParameterizedMessage("preIndex listener [{}] failed"; listener); e);
            return operation;


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