Failed to parse categorizerStats – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-8.9

Briefly, this error occurs when Elasticsearch is unable to parse the categorizerStats field, which is typically due to incorrect data format or a mismatch between the data and the mapping. To resolve this issue, you can check the data format and ensure it matches the mapping. If the error persists, you may need to update your mapping or reindex your data. Additionally, ensure that your Elasticsearch version supports the categorizerStats field.

This guide will help you check for common problems that cause the log ” failed to parse categorizerStats ” 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 categorizerStats” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 .createParser(XContentParserConfiguration.EMPTY.withDeprecationHandler(LoggingDeprecationHandler.INSTANCE); stream)
 ) {
 CategorizerStats categorizerStats = CategorizerStats.LENIENT_PARSER.apply(parser; null).build();
 } catch (IOException e) {
 throw new ElasticsearchParseException("failed to parse categorizerStats"; e);
 }  return new QueryPage<>(results; searchResponse.getHits().getTotalHits().value; ModelPlot.RESULTS_FIELD);