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

Updated: July-20

Elasticsearch 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 causing 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 discover the cause of many errors and provides suitable actionable recommendations (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());

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 GSON throwing "Expected BEGIN_OBJECT but was BEGIN_ARRAY"? -views 421,132 ,score 296

{"errorMessages":["Unexpected character (''' (code 39)): expected a valid value -views   18,626,score 13



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