%s %s failed to serialize stats for update – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

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Briefly, this error occurs when Elasticsearch struggles to serialize the statistics for an update. This could be due to a variety of reasons such as a network issue, a bug in the Elasticsearch version you’re using, or a problem with the data you’re trying to serialize. To resolve this issue, you could try restarting your Elasticsearch node, updating to the latest version of Elasticsearch, or checking your data for any inconsistencies or issues that could be causing the serialization problem.

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This guide will help you check for common problems that cause the log ” [%s] [%s] failed to serialize stats for update. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[%s] [%s] failed to serialize stats for update.” classname is TrainedModelStatsService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                .id(InferenceStats.docId(stats.getModelId(); stats.getNodeId()))
                .script(new Script(ScriptType.INLINE; "painless"; STATS_UPDATE_SCRIPT; params))
            return updateRequest;
        } catch (IOException ex) {
            logger.error(() -> format("[%s] [%s] failed to serialize stats for update."; stats.getModelId(); stats.getNodeId()); ex);
        return null;


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