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.
Overview
Metadata in Elasticsearch refers to additional information stored for each document. This is achieved using the specific metadata fields available in Elasticsearch. The default behavior of some of these metadata fields can be customized during mapping creation.
Examples
Using _meta meta-field for storing application-specific information with the mapping:
PUT /my_index?pretty
{
"mappings": {
"_meta": {
"domain": "security",
"release_information": {
"date": "18-01-2020",
"version": "7.5"
}
}
}
}Notes
- In version 2.x, Elasticsearch had a total 13 meta fields available, which are: _index, _uid, _type, _id, _source, _size, _all, _field_names, _timestamp, _ttl, _parent, _routing, _meta
- In version 5.x, _timestamp and _ttl meta fields were removed.
- In version 6.x, the _parent meta field was removed.
- In version 7.x, _uid and _all meta fields were removed.
Log Context
Log “[” + modelId + “] failed to parse model metadata” classname is TrainedModelProvider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
stream
)
) {
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) {
