Failed to parse date field with format – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.15

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Briefly, this error occurs when Elasticsearch is unable to parse a date field due to an incorrect or incompatible date format. This could be because the date format in the data doesn’t match the format specified in the mapping or during a query. To resolve this, ensure that the date format in your data matches the format specified in your Elasticsearch mapping. Alternatively, you can use the “date_optional_time” format which supports most date/time formats. If the error occurs during a query, make sure the date format in the query matches the one in the mapping.

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This guide will help you check for common problems that cause the log ” failed to parse date field [{}] with format [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .

Log Context

Log “failed to parse date field [{}] with format [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 } else if (end != value.length()) {
 throw new IllegalArgumentException("Unrecognized chars at the end of [" + value + "]: [" + value.substring(end) + "]");
 return date.getMillis();
 } catch (IllegalArgumentException e) {
 throw new ElasticsearchParseException("failed to parse date field [{}] with format [{}]"; e; value;
 }  }


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