Hit failed to parse _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 ” 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 and index.

Log Context

Log “[hit] failed to parse [_source]”classname  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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