Unexpected token ” + token + ” in ” + reducerName + “. – How to solve this Elasticsearch error

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Unexpected token ” + token + ” in ” + reducerName + “. – 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 ” Unexpected token ” + token + ” in ” + reducerName + “. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: 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 “Unexpected token ” + token + ” in [” + reducerName + “].”classname  is BucketSelectorPipelineAggregationBuilder.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

} else {
 throw new ParsingException(parser.getTokenLocation();
 "Unknown key for a " + token + " in [" + reducerName + "]: [" + currentFieldName + "].");
 }
 } else {
 throw new ParsingException(parser.getTokenLocation(); "Unexpected token " + token + " in [" + reducerName + "].");
 }
 } 
 if (bucketsPathsMap == null) {
 throw new ParsingException(parser.getTokenLocation(); "Missing required field [" + BUCKETS_PATH.getPreferredName()

 

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