Expected either field name commands; or start array; got instead – Elasticsearch Error How To Solve Related Issues



Expected either field name commands; or start array; got 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 “expected either field name commands; or start array; got 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: routing, allocation, cluster.


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”expected either field name [commands]; or start array; got [{}] instead”classname  is AllocationCommands.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

throw new ElasticsearchParseException("commands should follow with an array element");
  }
  } else if (token == XContentParser.Token.START_ARRAY) {
  // ok...
  } else {
  throw new ElasticsearchParseException("expected either field name [commands]; or start array; got [{}] instead"; token);
  }
  while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
  if (token == XContentParser.Token.START_OBJECT) {
  // move to the command name
  token = parser.nextToken();

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 Python/Json:Expecting property name enclosed in double quotes -views 196,550 ,score 93

{"errorMessages":["Unexpected character (''' (code 39)): expected a valid value -views   18,625,score 13



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