Failed to parse rules expression. expected to be an object but found instead – How to solve this Elasticsearch error

Average Read Time

2 Mins

Failed to parse rules expression. expected to be an object but found instead – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” failed to parse rules expression. expected to be an object but found instead ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, rest-high-level and client.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “failed to parse rules expression. expected [{}] to be an object but found [{}] instead”classname  is RoleMapperExpressionParser.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

token = parser.nextToken();
 } else {
 token = parser.currentToken();
 }
 if (token != XContentParser.Token.START_OBJECT) {
 throw new ElasticsearchParseException("failed to parse rules expression. expected [{}] to be an object but found [{}] instead";
 objectName; token);
 } 
 final String fieldName = fieldName(objectName; parser);
 final RoleMapperExpression expr = parseExpression(parser; fieldName; objectName);

 

Watch a demo of the Check-Up:

Analyze your cluster