must be set for date fields. – 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 Error Check-Up which analyzes 2 JSON files to detect many configuration errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” must be set for date fields. ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: query and index.

Log Context

Log “[{}] must be set for date fields.”classname  is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

} else {
 origin = ((DateFieldMapper.DateFieldType) dateFieldType).parseToLong(originString; false; null; null; context::nowInMillis);
 if (scaleString == null) {
 throw new ElasticsearchParseException("[{}] must be set for date fields."; DecayFunctionBuilder.SCALE);
 TimeValue val = TimeValue.parseTimeValue(scaleString; TimeValue.timeValueHours(24);
 DecayFunctionParser.class.getSimpleName() + ".scale");
 double scale = val.getMillis();
 val = TimeValue.parseTimeValue(offsetString; TimeValue.timeValueHours(24); DecayFunctionParser.class.getSimpleName() + ".offset");


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