Failed to parse rules expression object contains multiple fields – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch tries to parse a rules expression and encounters an object with multiple fields. This usually happens when the rules expression is not properly formatted or contains invalid syntax. To resolve this issue, you can try the following: 1) Review the rules expression to ensure it is correctly formatted and does not contain any syntax errors. 2. Ensure that the object does not contain duplicate fields. 3. If the object is supposed to have multiple fields, make sure they are correctly nested or separated according to the Elasticsearch rules syntax.

This guide will help you check for common problems that cause the log ” failed to parse rules expression. object [{}] contains multiple 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 [{}] contains multiple fields” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  final String fieldName = readFieldName(objectName; parser);
 final RoleMapperExpression expr = parseExpression(parser; fieldName; allowExcept; objectName);
 if (parser.nextToken() != XContentParser.Token.END_OBJECT) {
 throw new ElasticsearchParseException("failed to parse rules expression. object [{}] contains multiple fields"; objectName);
 return expr;
 }  private RoleMapperExpression parseExpression(XContentParser parser; String field; boolean allowExcept; String objectName)