Failed to parse / load source – 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 parse / load source ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: source and 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 parse / load source”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

Tuple> tuple = sourceAsMapAndType(source);
 this.sourceContentType = tuple.v1();
 this.source = tuple.v2();
 } catch (Exception e) {
 throw new ElasticsearchParseException("failed to parse / load source"; e);
 return this.source;
 public static Tuple> sourceAsMapAndType(BytesReference source) throws ElasticsearchParseException {


Watch product tour

Watch how AutoOps finds & fixes Elasticsearch problems

Analyze Your Cluster
Skip to content