Failed to parse field of type – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

Briefly, this error occurs when Elasticsearch is unable to parse a field of a certain type, such as a date field or a numerical field. This error may be caused by a malformed or invalid value in the field, or by a mismatch between the field type and the value being stored. To resolve the issue, you can try correcting any malformed or invalid values, ensuring that the field type matches the value being stored, or adjusting the field mapping to match the data being indexed.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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 Elasticsearch concepts: index.

Log Context

Log “failed to parse field [{}] of type [{}]”classname  is We extracted the following from Elasticsearch 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();


See how you can use AutoOps to resolve issues

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