Failed to parse field of type – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to interpret a field due to a mismatch in the expected data type. This could be due to incorrect data input or a misconfigured mapping. To resolve this, ensure that the data being inputted matches the field’s defined data type. If the error persists, check the mapping configuration for any inconsistencies. If necessary, you may need to reindex your data with the correct mapping.

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This guide will help you check for common problems that cause the log ” failed to parse field [{}] of type [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “failed to parse field [{}] of type [{}]” class name is We extracted the following from OpenSearch source code for those seeking an in-depth context :

 // add multifields (e.g.; used for completion suggester)
 addMultiFields(context; shape);
 } catch (Exception e) {
 if (ignoreMalformed.value() == false) {
 throw new MapperParsingException("failed to parse field [{}] of type [{}]"; e; fieldType().name(); fieldType().typeName());


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