Key date doc count – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-6.8

Briefly, this error occurs when Elasticsearch is unable to find the ‘doccount’ field in the ‘date’ key. This could be due to a missing or incorrectly named field in your data or a mistake in your query. To resolve this issue, you can check your data to ensure the ‘doccount’ field exists under the ‘date’ key. If it does, verify your query to ensure you’re correctly referencing the field. If the field doesn’t exist, you may need to add it to your data or adjust your query to reference a different field.

This guide will help you check for common problems that cause the log ” Key [{}]; date [{}]; doc_count [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: aggregations.

Log Context

Log “Key [{}]; date [{}]; doc_count [{}]” classname is datehistogram-aggregation.asciidoc.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 for (Histogram.Bucket entry : agg.getBuckets()) {
    DateTime key = (DateTime) entry.getKey();    // Key
    String keyAsString = entry.getKeyAsString(); // Key as String
    long docCount = entry.getDocCount();         // Doc count"key [{}]; date [{}]; doc_count [{}]"; keyAsString; key.getYear(); docCount);

This will basically produce for the first example:


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