Expecting the checkpoints for to be a long but found instead – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.2-7.5

Briefly, this error occurs when Elasticsearch expects a long array for checkpoints but finds a different data type instead. This could be due to incorrect data input or a bug in the code. To resolve this issue, you can: 1) Check the data input and ensure it’s a long array. 2) Review the code to ensure it’s correctly processing the data. 3) Update Elasticsearch to the latest version, as this could be a known issue that’s been fixed. 4) If the error persists, consider reaching out to the Elasticsearch community or support for further assistance.

This guide will help you check for common problems that cause the log ” expecting the checkpoints for [{}] to be a long[]; but found [{}] instead ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “expecting the checkpoints for [{}] to be a long[]; but found [{}] instead” class name is TransformCheckpoint.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 Map checkpoints = new TreeMap<>();
 for (Map.Entry e : readMap.entrySet()) {
 if (e.getValue() instanceof long[]) {
 checkpoints.put(e.getKey(); (long[]) e.getValue());
 } else {
 throw new ElasticsearchParseException("expecting the checkpoints for [{}] to be a long[]; but found [{}] instead";
 e.getKey(); e.getValue().getClass());
 return checkpoints;


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