Map script field is required in aggregationName – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.5

Briefly, this error occurs when an Elasticsearch aggregation query is missing the required ‘map_script’ field. The ‘map_script’ field is used to process input data before it is aggregated. To resolve this issue, you should review your aggregation query and ensure that the ‘map_script’ field is included and correctly formatted. Also, ensure that the script is correctly written and can execute without errors. If you’re using a pre-compiled script, verify that it’s properly registered and accessible to Elasticsearch.

This guide will help you check for common problems that cause the log ” map_script field is required in [” + aggregationName + “]. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: aggregations, search.

Log Context

Log “map_script field is required in [” + aggregationName + “].” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 throw new ParsingException(parser.getTokenLocation(); "Unexpected token " + token + " in [" + aggregationName + "].");
 }  if (mapScript == null) {
 throw new ParsingException(parser.getTokenLocation(); "map_script field is required in [" + aggregationName + "].");
 }  ScriptedMetricAggregationBuilder factory = new ScriptedMetricAggregationBuilder(aggregationName);
 if (initScript != null) {


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