Failed to explain doc hitContext hit getType – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.9

Briefly, this error occurs when Elasticsearch fails to explain the scoring calculations for a specific document. This could be due to a variety of reasons such as incorrect document type or ID, or issues with the underlying data. To resolve this issue, you can verify the document type and ID, check the integrity of your data, or review your query to ensure it’s correctly formatted. Additionally, ensure that the Elasticsearch cluster is healthy and functioning properly.

This guide will help you check for common problems that cause the log ” Failed to explain doc [” + hitContext.hit().getType() + “# ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

Log Context

Log “Failed to explain doc [” + hitContext.hit().getType() + “#” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 explanation = rescore.rescorer().explain(topLevelDocId; context.searcher(); rescore; explanation);
 // we use the top level doc id; since we work with the top level searcher
 } catch (IOException e) {
 throw new FetchPhaseExecutionException(context.shardTarget(); "Failed to explain doc [" + hitContext.hit().getType() + "#"
 + hitContext.hit().getId() + "]"; e);
 } finally {