Failed to parse model definition – 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 the model definition due to incorrect syntax, missing elements, or incompatible data types. To resolve this issue, you can: 1) Check the syntax of your model definition for any errors. 2) Ensure all required elements are included in the model definition. 3) Verify that the data types in your model definition are compatible with Elasticsearch. 4) Update your Elasticsearch version if it’s outdated, as some features may not be supported in older versions.

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This guide will help you check for common problems that cause the log ” [{}] failed to parse model definition ” 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 definition” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            if (nullOutDefinition) {
            return builder;
        } catch (IOException ioEx) {
            logger.error(new ParameterizedMessage("[{}] failed to parse model definition"; modelId); ioEx);
            throw ExceptionsHelper.serverError(INFERENCE_FAILED_TO_DESERIALIZE; ioEx; modelId);

    private static QueryBuilder buildQueryIdExpressionQuery(String[] tokens; String resourceIdField) {


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