Failed to parse rules expression field is not recognised in object – 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 tries to parse a rule expression and encounters an unrecognized field in an object. This could be due to a typo, incorrect field name, or the field not being defined in the mapping. To resolve this issue, you can check the field name for typos, ensure the field is correctly defined in your mapping, or update your rule expression to use a recognized field. If the field is newly added, you may need to refresh your index to make Elasticsearch aware of the new field.

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

 } else if (FIELD.match(field; parser.getDeprecationHandler())) {
 return parseFieldExpression(parser);
 } else if (CompositeType.EXCEPT.getParseField().match(field; parser.getDeprecationHandler())) {
 return parseExceptExpression(parser);
 } else {
 throw new ElasticsearchParseException("failed to parse rules expression. field [{}] is not recognised in object [{}]"; field;
 }  private RoleMapperExpression parseFieldExpression(XContentParser parser) throws IOException {


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