Reason – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.6-8.1

Briefly, this error occurs when Elasticsearch encounters an issue but the error message is not specific enough to identify the exact problem. It could be due to a variety of reasons such as incorrect query syntax, insufficient memory, or connectivity issues. To resolve this, you can check the Elasticsearch logs for more detailed error information. Ensure your queries are correctly formatted and that the cluster has enough resources. Also, verify that all nodes are properly connected and functioning. If the problem persists, consider upgrading Elasticsearch to the latest version as it may be a bug that has been fixed.

This guide will help you check for common problems that cause the log ” reason ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: client, rest-high-level.

Log Context

Log “reason” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 static {
 PARSER.declareString(constructorArg(); new ParseField("node_id"));
 PARSER.declareLong(constructorArg(); new ParseField("task_id"));
 PARSER.declareString(constructorArg(); new ParseField("status"));
 PARSER.declareObject(constructorArg(); (parser; c) -> ElasticsearchException.fromXContent(parser); new ParseField("reason"));