Could not parse cron schedule – How to solve this Elasticsearch error

Could not parse cron schedule – How to solve this Elasticsearch error

Opster Team

July-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” could not parse cron schedule ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: plugin.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”could not parse [cron] schedule”classname  is CronSchedule.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

XContentParser.Token token = parser.currentToken();
  if (token == XContentParser.Token.VALUE_STRING) {
  try {
  return new CronSchedule(parser.text());
  } catch (IllegalArgumentException iae) {
  throw new ElasticsearchParseException("could not parse [cron] schedule"; iae);
  }
  } else if (token == XContentParser.Token.START_ARRAY) {
  List crons = new ArrayList();
  while ((token = parser.nextToken()) != XContentParser.Token.END_ARRAY) {
  switch (token) {

Run the Check-Up to get a customized report like this:

check-up-dashboard illustration

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