Error filtering source – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.5

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Briefly, this error occurs when Elasticsearch is unable to filter the source data due to incorrect or invalid filter queries. This could be due to syntax errors, incorrect field names, or unsupported filter types. To resolve this issue, you can: 1) Check and correct the syntax of your filter query. 2) Verify that the field names in your filter query match those in your data source. 3) Ensure that the filter types you’re using are supported by Elasticsearch. 4) If the error persists, consider simplifying your filter query or breaking it down into smaller parts to identify the problematic section.

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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 Elasticsearch concepts: source, search.

Log Context

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

 try {
 final int initialCapacity = nestedHit ? 1024 : Math.min(1024; source.internalSourceRef().length());
 hitContext.hit().sourceRef(objectToBytes(value; source.sourceContentType(); initialCapacity));
 } catch (IOException e) {
 throw new ElasticsearchException("Error filtering source"; e);
 }  @Override
 public Map getDebugInfo() {


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