ModelId failed to parse model definition – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch is unable to parse the model definition due to incorrect syntax, missing fields, or invalid data types. To resolve this issue, you should first verify the syntax of your model definition. Ensure that all required fields are included and that the data types are correct. If the error persists, try to simplify your model definition to identify the problematic part. Lastly, ensure that your Elasticsearch version supports the features used in your model definition.

This guide will help you check for common problems that cause the log ” [” + modelId + “] 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 “[” + modelId + “] 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(() -> "[" + modelId + "] failed to parse model definition"; ioEx);
            throw ExceptionsHelper.serverError(INFERENCE_FAILED_TO_DESERIALIZE; ioEx; modelId);

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


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