Failed to parse / load source – How to solve this Elasticsearch error

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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 Error 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. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the 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 which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

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 {


Run the Check-Up to get a customized report like this:

Analyze your cluster