Could not parse inner source definition – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to parse the _source field in a document due to incorrect syntax or structure. This could be due to a malformed JSON or incorrect field mapping. To resolve this issue, you can: 1) Check the JSON structure for any syntax errors and correct them. 2) Verify the field mapping in your index to ensure it matches the data type in your _source field. 3) If the error persists, consider reindexing your data with the correct mapping and JSON structure.

This guide will help you check for common problems that cause the log ” Could not parse inner _source definition ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query, index.

Log Context

Log “Could not parse inner _source definition” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 PARSER.declareField((p; i; c) -> {
 try {
 } catch (IOException e) {
 throw new ParsingException(p.getTokenLocation(); "Could not parse inner _source definition"; e);
 }; SearchSourceBuilder._SOURCE_FIELD; ObjectParser.ValueType.OBJECT_ARRAY_BOOLEAN_OR_STRING);
 (p; c) -> HighlightBuilder.fromXContent(p);


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