Unknown field name field – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.9

Briefly, this error occurs when Elasticsearch tries to access a field that doesn’t exist in the index. 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 check the field name for typos, ensure the field exists in the index mapping, or add the field to the index mapping if it’s missing. If the field is not required, you can also handle the error in your application code to ignore the field.

This guide will help you check for common problems that cause the log ” unknown field name [” + field + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: repositories.

Log Context

Log “unknown field name [” + field + “]” class name is RepositoryData.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ElasticsearchParseException("version string expected [min_version]");
 final Version version = Version.fromString(parser.text());
 assert SnapshotsService.useShardGenerations(version);
 } else {
 throw new ElasticsearchParseException("unknown field name  [" + field + "]");
 } else {
 throw new ElasticsearchParseException("start object expected");


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