Failed to parse load source – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.6

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Briefly, this error occurs when Elasticsearch is unable to parse or load the source data due to incorrect data format, syntax errors, or incompatible data types. To resolve this issue, you can: 1) Check the data format and ensure it matches the expected format. 2) Review the syntax of your query or data source for any errors. 3) Verify the data types in your source data and ensure they are compatible with your Elasticsearch schema. 4) If the source is a file, ensure it’s accessible and not corrupted.

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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, search.

Log Context

Log “failed to parse / load source” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else {
 sourceProvider = new BytesSourceProvider(sourceAsBytes);
 ((BytesSourceProvider) sourceProvider).parseSource();
 } catch (Exception e) {
 throw new ElasticsearchParseException("failed to parse / load source"; e);
 }  @Override
 public XContentType sourceContentType() {


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