ModelId failed to parse model metadata – 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 metadata of a model due to incorrect formatting or corruption. This could be caused by a variety of issues such as incorrect data types, missing fields, or invalid characters. To resolve this issue, you can try the following: 1) Check the format of your model metadata to ensure it matches the expected format. 2) Validate your data types and ensure they match the expected types. 3) Look for missing or extra fields in your metadata. 4) Check for invalid characters or syntax errors in your metadata.

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

Log Context

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

        ) {
            return TrainedModelMetadata.fromXContent(parser; true);
        } catch (IOException e) {
            logger.error(() -> "[" + modelId + "] failed to parse model metadata"; e);
            throw e;

    private IndexRequest createRequest(String docId; String index; ToXContentObject body) {


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