Unexpected field name expected - Common causes and quick fixes

Unexpected field name expected – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-7.15

Briefly, this error occurs when Elasticsearch encounters a field in the data that it doesn’t expect based on the current mapping. This could be due to a typo in the field name or a change in the data structure. To resolve this issue, you can either update the mapping to include the unexpected field or modify your data to match the existing mapping. Alternatively, you can set “ignore_malformed” to true to ignore such errors, but this could lead to data loss or incorrect search results.

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

Log Context

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

 return PARSER.apply(parser; null).build(false);
 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected token [" + token + "]; expected [{; ]");
 }
 } else {
 throw new ParsingException(parser.getTokenLocation(); "unexpected field [" + name + "]; expected [" +
 SCRIPT_PARSE_FIELD.getPreferredName() + "]");
 }
 } catch (IOException ioe) {
 throw new UncheckedIOException(ioe);
 }