Error filtering source – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when there’s an issue with the filtering process in OpenSearch. It could be due to incorrect filter syntax, non-existent fields, or incompatible data types. To resolve this, ensure that the filter syntax is correct and the fields used in the filter exist in the index. Also, check the data types of the fields and ensure they are compatible with the filter operation. If the error persists, consider reindexing your data or adjusting your filter parameters.

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This guide will help you check for common problems that cause the log ” Error filtering source ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: search, source.

Log Context

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

 } catch (IOException e) {
 throw new OpenSearchException("Error filtering source"; e);
 }  private static boolean containsFilters(FetchSourceContext context) {
 return context.includes().length != 0 || context.excludes().length != 0;


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