Hit failed to parse source – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to parse the [_source] field in a document. This could be due to incorrect data types, malformed JSON, or a mismatch between the data and the mapping. To resolve this issue, you can: 1) Check the format and data types of your [_source] field to ensure they match the mapping. 2) Validate your JSON to ensure it’s correctly formatted. 3) Update your mapping if the data types have changed. 4) Reindex your data if necessary.

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This guide will help you check for common problems that cause the log ” [hit] failed to parse [_source] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: reindex.

Log Context

Log “[hit] failed to parse [_source]” class name is RemoteResponseParsers.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // a hack but this lets us get the right xcontent type to go with the source
 return new Tuple<>(BytesReference.bytes(b); s);
 } catch (IOException e) {
 throw new ParsingException(p.getTokenLocation(); "[hit] failed to parse [_source]"; e);
 }; new ParseField("_source"));
 ParseField routingField = new ParseField("_routing");
 ParseField ttlField = new ParseField("_ttl");
 ParseField parentField = new ParseField("_parent");


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