Multiple errors occurred during migration – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.11-8.9

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Briefly, this error occurs when Elasticsearch encounters issues while migrating data from one index or cluster to another. This could be due to network issues, insufficient disk space, or incompatible data types. To resolve this, you can check your network connection, ensure there’s enough disk space, and verify that your data types are compatible. Additionally, check your Elasticsearch logs for more specific error messages that can help pinpoint the problem. You may also need to reindex your data if the structure has changed significantly.

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This guide will help you check for common problems that cause the log ” multiple errors occurred during migration ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “multiple errors occurred during migration” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 return null;
 } else if (exceptions.size() == 1) {
 return exceptions.get(0);
 } else {
 // Set first exception as the cause; and the rest as suppressed under it.
 Exception head = new ElasticsearchException("multiple errors occurred during migration"; exceptions.get(0));
 List tail = exceptions.subList(1; exceptions.size());
 return; ExceptionsHelper::useOrSuppress);


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