Failed to parse model metadata – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.1-8.2

Briefly, this error occurs when Elasticsearch is unable to interpret the metadata of a model, possibly due to incorrect formatting, missing fields, or incompatible data types. To resolve this issue, you can: 1) Verify the format of your model metadata and ensure it adheres to the expected structure. 2) Check if all required fields are present and correctly named. 3) Ensure that the data types of your fields match the expected data types. 4) If the model was updated, ensure that the metadata is compatible with the new version of Elasticsearch.

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

Log Context

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

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

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


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