Failed to highlight field highlighterContext fieldName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.4

Before you dig into reading this guide, have you tried asking OpsGPT what this log means? You’ll receive a customized analysis of your log.

Try OpsGPT now for step-by-step guidance and tailored insights into your Elasticsearch operation.

Briefly, this error occurs when Elasticsearch fails to highlight a specific field during a search query. This could be due to incorrect field name, non-textual field, or a large field size. To resolve this, ensure the field name is correct and the field is of a textual data type. If the field is large, consider increasing the highlight.max_analyzed_offset setting or use the ignore_above parameter to limit the size of the field.

For a complete solution to your to your search operation, try for free AutoOps for Elasticsearch & OpenSearch . With AutoOps and Opster’s proactive support, you don’t have to worry about your search operation – we take charge of it. Get improved performance & stability with less hardware.

This guide will help you check for common problems that cause the log ” Failed to highlight field [” + highlighterContext.fieldName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: search.

Log Context

Log “Failed to highlight field [” + highlighterContext.fieldName + “]” class name is PlainHighlighter.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // this can happen if for example a field is not_analyzed and ignore_above option is set.
 // the field will be ignored when indexing but the huge term is still in the source and
 // the plain highlighter will parse the source and try to analyze it.
 return null;
 } else {
 throw new FetchPhaseExecutionException(context; "Failed to highlight field [" + highlighterContext.fieldName + "]"; e);
 }
 }
 if (field.fieldOptions().scoreOrdered()) {
 CollectionUtil.introSort(fragsList; new Comparator() {
 @Override

 

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?