Expected group separator at offset found – 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 encounters an unexpected character while parsing a date. The error message indicates that a group separator was expected at a certain position in the date string, but a different character was found. To resolve this issue, you can either correct the date format in your data or adjust the date format in your Elasticsearch mapping to match the format of your data. Additionally, ensure that your date strings are correctly formatted and do not contain any unexpected characters or spaces.

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This guide will help you check for common problems that cause the log ” {}expected group separator at offset [{}]; found [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, parser.

Log Context

Log “{}expected group separator at offset [{}]; found [{}]” class name is ExpressionBuilder.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  int[] separatorPos = { 8; 13; 18; 23 };
 for (int pos : separatorPos) {
 if (lowerCase.charAt(pos) != '-') {
 throw new ParsingException(source; "{}expected group separator at offset [{}]; found [{}]";
 errorPrefix; pos; string.charAt(pos));
 }  String HEXA = "0123456789abcdef";


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