Failed to parse model – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when Elasticsearch is unable to parse the model for an index. This can happen when there is an issue with the mapping or the index data. To resolve the issue, you should investigate the root cause of the error and take appropriate action to fix the problem.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Failed to parse model ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “[{}] failed to parse model” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         try (InputStream stream = source.streamInput();
             XContentParser parser = XContentFactory.xContent(XContentType.JSON)
                 .createParser(xContentRegistry; LoggingDeprecationHandler.INSTANCE; stream)) {
            return TrainedModelConfig.fromXContent(parser; true);
        } catch (IOException e) {
            logger.error(new ParameterizedMessage("[{}] failed to parse model"; modelId); e);
            throw e;

    private TrainedModelDefinitionDoc parseModelDefinitionDocLenientlyFromSource(BytesReference source; String modelId) throws IOException {


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