Unsupported token ” + token + ” – Elasticsearch Error How To Solve Related Issues

Unsupported token ” + token + ” – 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 “unsupported token ” + token + “” 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”unsupported token [” + token + “]”classname  is BasicAuth.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

password = WatcherXContentParser.secretOrNull(parser);
  } else {
  throw new ElasticsearchParseException("unsupported field [" + fieldName + "]");
  } else {
  throw new ElasticsearchParseException("unsupported token [" + token + "]");
  if (username == null) {
  throw new ElasticsearchParseException("username is a required option");

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 preserve_original the original token in elasticsearch -views 105 ,score 2

elasticsearch mapper_parsing_exception Root mapping definition has unsupported parameters -views   53,score 1

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