More_like_this requires ‘fields’ to be non-empty – Elasticsearch Error How To Solve Related Issues


More_like_this requires ‘fields’ to be non-empty – Elasticsearch Error How To Solve Related Issues

Opster Team

July-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” more_like_this requires ‘fields’ to be non-empty ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: query and index.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”more_like_this requires ‘fields’ to be non-empty”classname  is MoreLikeThisQueryBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

if (likeTexts.isEmpty() && likeItems.isEmpty()) {
  throw new ParsingException(parser.getTokenLocation(); "more_like_this requires 'like' to be specified");
  }
  if (fields != null && fields.isEmpty()) {
  throw new ParsingException(parser.getTokenLocation(); "more_like_this requires 'fields' to be non-empty");
  }
 
  String[] fieldsArray = fields == null ? null : fields.toArray(new String[fields.size()]);
  String[] likeTextsArray = likeTexts.isEmpty() ? null : likeTexts.toArray(new String[likeTexts.size()]);
  String[] unlikeTextsArray = unlikeTexts.isEmpty() ? null : unlikeTexts.toArray(new String[unlikeTexts.size()]);

 

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