Expected ” + XContentParser.Token.START_OBJECT + ” under – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Expected ” + XContentParser.Token.START_OBJECT + ” under ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, search and aggregations.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Expected [” + XContentParser.Token.START_OBJECT + “] under [“classname  is AggregatorFactories.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

SuggestingErrorOnUnknown.suggest(fieldName; ex.getCandidates()));
 throw new ParsingException(new XContentLocation(ex.getLineNumber(); ex.getColumnNumber()); message; ex);
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Expected [" + XContentParser.Token.START_OBJECT + "] under ["
 + fieldName + "]; but got a [" + token + "] in [" + aggregationName + "]");
 if (aggBuilder == null) {


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