Failed to parse field fieldType name of type contentType – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.13-8.7

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Briefly, this error occurs when Elasticsearch is unable to parse a field due to a mismatch between the actual data type and the expected data type defined in the mapping. This could be due to incorrect data input or incorrect mapping. To resolve this issue, you can either correct the data input to match the expected data type or update the mapping to reflect the correct data type. Additionally, you can use the “ignore_malformed” option 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 ” failed to parse field [” + fieldType().name() + “] of type [” + contentType() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “failed to parse field [” + fieldType().name() + “] of type [” + contentType() + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 parser.parse(context.parser(); v -> index(context; v); e -> {
 if (ignoreMalformed()) {
 } else {
 throw new MapperParsingException("failed to parse field [" + fieldType().name() + "] of type [" + contentType() + "]"; e);
 }  @Override


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