Briefly, this error occurs when Elasticsearch is unable to parse a schedule due to incorrect or missing cron syntax in the schedule field. This could be due to a malformed cron expression or an empty schedule field. To resolve this issue, ensure that the cron expression is correctly formatted according to the Quartz cron format. Also, make sure that the schedule field is not left empty. If you’re not using a schedule, consider removing the field entirely.
This guide will help you check for common problems that cause the log ” could not parse schedule: {} ” 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 schedule: {}” class name is IntervalSchedule.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (token == XContentParser.Token.VALUE_STRING) {
String value = parser.text();
return new IntervalSchedule(Interval.parse(value));
}
} catch (Exception e) {
throw new ElasticsearchParseException("could not parse schedule: {}"; e; e.getMessage());
}
throw new ElasticsearchParseException(
"could not parse [{}] schedule. expected either a numeric value "
+ "(millis) or a string value representing time value (e.g. '5s'); but found [{}]";
TYPE;
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