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 analyzes 2 JSON files to detect many configuration errors.

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 / load source ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: source and search.

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 {


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