Unknown object property fieldName – 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 encounters an unknown field in the JSON object during indexing or querying. This could be due to a typo in the field name or the field not being defined in the mapping. To resolve this issue, you can either correct the field name if it’s a typo, or update the index mapping to include the new field. Alternatively, you can set “ignore_malformed” to true in your index settings to ignore such errors, but this could lead to data loss or incorrect search results.

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This guide will help you check for common problems that cause the log ” Unknown object property: [” + fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: rest, plugin.

Log Context

Log “Unknown object property: [” + fieldName + “]” class name is RestGraphAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 throw new ElasticsearchParseException("Unknown property: [" + fieldName + "]");
 }
 }
 } else {
 throw new ElasticsearchParseException("Unknown object property: [" + fieldName + "]");
 }
 } else {
 throw new ElasticsearchParseException("Unknown object property: [" + fieldName + "]");
 }
 }

 

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