Invalid unicode character code – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.13-8.9

Briefly, this error occurs when Elasticsearch encounters a character that is not valid in the Unicode standard. This could be due to incorrect encoding or corruption of data. To resolve this issue, you can try the following: 1) Check the encoding of your data source and ensure it’s in UTF-8 format. 2) Validate your data to identify and remove any invalid characters. 3) If you’re using a script or program to input data, ensure it’s correctly handling Unicode characters.

This guide will help you check for common problems that cause the log ” Invalid unicode character code [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: parser, plugin.

Log Context

Log “Invalid unicode character code [{}]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 if (code >= 0xD800 && code <= 0xDFFF) {
 throw new ParsingException(source; "Invalid unicode character code; [{}] is a surrogate code"; hex);
 return String.valueOf(Character.toChars(code));
 } catch (IllegalArgumentException e) {
 throw new ParsingException(source; "Invalid unicode character code [{}]"; hex);
 }  private static void checkForSingleQuotedString(Source source; String text; int i) {
 if (text.charAt(i) == '\'') {


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