Failed to parse object: Expected START_OBJECT but was: – Elasticsearch Error How To Solve Related Issues



Failed to parse object: Expected START_OBJECT but was: – 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 “Failed to parse object: Expected START_OBJECT but was:” 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: rest-high-level, client.


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”Failed to parse object: Expected START_OBJECT but was:”classname  is GroupConfig.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

// be parsing friendly; whether the token needs to be advanced or not (similar to what ObjectParser does)
  XContentParser.Token token;
  if (parser.currentToken() != XContentParser.Token.START_OBJECT) {
  token = parser.nextToken();
  if (token != XContentParser.Token.START_OBJECT) {
  throw new ParsingException(parser.getTokenLocation(); "Failed to parse object: Expected START_OBJECT but was: " + token);
  }
  }
 
  while ((token = parser.nextToken()) != XContentParser.Token.END_OBJECT) {
  ensureExpectedToken(XContentParser.Token.FIELD_NAME; token; parser::getTokenLocation);

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 ElasticSearch – failed to parse search source. expected field name but got [START_OBJECT] -views 8,785 ,score 3

failed to parse search source, expected field name but got [START_OBJECT] -views   2,768



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