Failed to parse rules expression object does not contain any fields – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch tries to parse a rules expression from an object that doesn’t contain any fields. This could be due to a malformed request or an empty object being passed. To resolve this issue, you can check the request being sent to ensure it contains valid fields. Also, verify that the object being passed is not empty. If you’re using a script to generate the request, ensure it’s correctly formatted and populating the necessary fields.

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This guide will help you check for common problems that cause the log ” failed to parse rules expression. object [{}] does not contain any fields ” 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 rules expression. object [{}] does not contain any fields” class name is ExpressionParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }
 }  private String readFieldName(String objectName; XContentParser parser) throws IOException {
 if (parser.nextToken() != XContentParser.Token.FIELD_NAME) {
 throw new ElasticsearchParseException("failed to parse rules expression. object [{}] does not contain any fields"; objectName);
 }
 return parser.currentName();
 }  private List parseExpressionArray(ParseField field; XContentParser parser; boolean allowExcept)

 

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