Unknown property fieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters a field in the data that it doesn’t recognize or isn’t defined in the mapping. This could be due to a typo in the field name or a mismatch between the data and the defined mapping. To resolve this issue, you can either correct the field name in your data to match the mapping, or update the mapping to include the new field. If the field is not necessary, you can also remove it from your data.

This guide will help you check for common problems that cause the log ” Unknown 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 property: [” + fieldName + “]” class name is RestGraphAction.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (FIELD_NAME_FIELD.match(fieldName; parser.getDeprecationHandler())) {
 } else if (MAX_DOCS_PER_VALUE_FIELD.match(fieldName; parser.getDeprecationHandler())) {
 } else {
 throw new ElasticsearchParseException("Unknown property: [" + fieldName + "]");
 } else {
 throw new ElasticsearchParseException("Unknown object property: [" + fieldName + "]");


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