Could not parse field. expected a string array but found null value instead – Elasticsearch Error How To Solve Related Issues


Could not parse field. expected a string array but found null value instead – 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 ” could not parse field. expected a string array but found null value instead ” 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: plugin.

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”could not parse [{}] field. expected a string array but found null value instead”classname  is XContentUtils.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

public static String[] readStringArray(XContentParser parser; boolean allowNull) throws IOException {
  if (parser.currentToken() == XContentParser.Token.VALUE_NULL) {
  if (allowNull) {
  return null;
  }
  throw new ElasticsearchParseException("could not parse [{}] field. expected a string array but found null value instead";
  parser.currentName());
  }
  if (parser.currentToken() != XContentParser.Token.START_ARRAY) {
  throw new ElasticsearchParseException("could not parse [{}] field. expected a string array but found [{}] value instead";
  parser.currentName(); parser.currentToken());

 

Optimize Elasticsearch Performance

Try The Tool