Briefly, this error occurs when Elasticsearch is unable to parse the cron schedule because it expects a string value. This usually happens when the cron expression is incorrectly formatted or missing. To resolve this issue, ensure that the cron expression is correctly formatted as a string and is included in the schedule. Also, verify that the cron expression is valid and follows the correct syntax. If the problem persists, consider checking for any updates or bugs related to the Elasticsearch version you are using.
This guide will help you check for common problems that cause the log ” could not parse [cron] schedule. expected a string value in the cron ” 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. expected a string value in the cron” class name is CronSchedule.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
switch (token) {
case VALUE_STRING:
crons.add(parser.text());
break;
default:
throw new ElasticsearchParseException("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");
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