Failed to load field – 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 Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” failed to load field ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “failed to load field [{}]”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

values = new ArrayList<>(2);
 SingleFieldsVisitor visitor = new SingleFieldsVisitor(data.fieldType(); values);
 try {
 reader.document(docId; visitor);
 } catch (IOException e) {
 throw new ElasticsearchParseException("failed to load field [{}]"; e; name);
 data.fields(singletonMap(data.fieldType().name(); values));
 return data;


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