Failed to parse rules expression expected a field value but found instead – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch is unable to parse a rule expression due to an unexpected field value. This usually happens when the expected data type doesn’t match the provided value. To resolve this issue, you should first check the syntax of your rule expression. Ensure that the field values are correctly formatted and match the expected data type. If the error persists, consider re-indexing your data to ensure that all fields are correctly mapped. Lastly, ensure that your Elasticsearch version supports the features used in your rule expression.

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This guide will help you check for common problems that cause the log ” failed to parse rules expression. expected a field value 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, client.

Log Context

Log “failed to parse rules expression. expected a field value but found [{}] instead” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return null;  default:
 throw new ElasticsearchParseException("failed to parse rules expression. expected a field value but found [{}] instead"; parser
 }  }


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