Key doc count – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is unable to retrieve the document count for a specific key. This could be due to a variety of reasons such as incorrect query syntax, insufficient permissions, or a problem with the underlying data. To resolve this issue, you can try the following: 1) Check and correct your query syntax, 2) Ensure the user has the necessary permissions to access the document count, 3) Investigate the underlying data for any inconsistencies or corruption, and 4) If the problem persists, consider reindexing your data.

This guide will help you check for common problems that cause the log ” key [{}]; 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 [{}]; doc_count [{}]” classname is histogram-aggregation.asciidoc.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 // For each entry
for (Histogram.Bucket entry : agg.getBuckets()) {
    Long key = (Long) entry.getKey();       // Key
    long docCount = entry.getDocCount();    // Doc count"key [{}]; doc_count [{}]"; key; docCount);


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