Could not explain – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to provide an explanation for a specific query or operation. This could be due to a malformed query, missing data, or an internal server error. To resolve this issue, you can try the following: 1) Check the syntax of your query to ensure it’s correct. 2) Verify that the data you’re querying exists and is accessible. 3) Check the Elasticsearch server logs for any internal errors and address them. 4) If the problem persists, consider restarting the Elasticsearch server.

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

Log Context

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

 return new ExplainResponse(shardId.getIndexName();; true; explanation; getResult);
 } else {
 return new ExplainResponse(shardId.getIndexName();; true; explanation);
 } catch (IOException e) {
 throw new ElasticsearchException("Could not explain"; e);
 } finally {
 Releasables.close(result; context);


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?