Failed to parse model – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.6-8.2

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Briefly, this error occurs when Elasticsearch is unable to parse a model due to incorrect syntax, missing fields, or incompatible data types. To resolve this issue, you should first check the model’s syntax for any errors. Ensure that all required fields are present and that the data types match what Elasticsearch expects. If the model is complex, consider breaking it down into smaller parts and testing each one individually. Lastly, ensure that your Elasticsearch version supports the features used in your model.

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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 :

                // is a tree ensemble
            return builder;
        } catch (IOException e) {
            logger.error(new ParameterizedMessage("[{}] failed to parse model"; modelId); e);
            throw e;

    private TrainedModelMetadata parseMetadataLenientlyFromSource(BytesReference source; String modelId) throws IOException {


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