Illegal object property in graph definition – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when there is an invalid or unrecognized property in the graph definition of Elasticsearch. This could be due to a typo, incorrect syntax, or use of a property that is not supported. To resolve this issue, you should first verify the property names and their syntax in your graph definition. Ensure that all properties are correctly spelled and are supported by the version of Elasticsearch you are using. If the error persists, consider simplifying your graph definition to identify the problematic property.

This guide will help you check for common problems that cause the log ” Illegal object property in graph definition ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: rest, plugin.

Log Context

Log “Illegal object property in graph definition” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :
 parseControls(parser; graphRequest);
 } else {
 throw new ElasticsearchParseException("Illegal object property in graph definition " + fieldName;;  }
 } else {
 throw new ElasticsearchParseException("Illegal property in graph definition " + fieldName;;