Could not parse cron schedule no cron expression found in cron array – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch is unable to parse the cron schedule because it can’t find a valid cron expression in the cron array. This usually happens when the cron expression is missing or incorrectly formatted. To resolve this issue, you can: 1) Ensure that a valid cron expression is provided in the cron array. 2) Check the syntax of the cron expression to ensure it’s correctly formatted. 3) If the cron array is empty, add a valid cron expression to it.

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This guide will help you check for common problems that cause the log ” could not parse [cron] schedule. no cron expression found in cron array ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “could not parse [cron] schedule. no cron expression found in cron array” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 "could not parse [cron] schedule. expected a string value in the cron " + "array but found [" + token + "]"
 if (crons.isEmpty()) {
 throw new ElasticsearchParseException("could not parse [cron] schedule. no cron expression found in cron array");
 try {
 return new CronSchedule(crons.toArray(String[]::new));
 } catch (IllegalArgumentException iae) {
 throw new ElasticsearchParseException("could not parse [cron] schedule"; iae);


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