Expected number but found – How to solve this OpenSearch exception

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch expects a numerical value in a specific field or parameter, but encounters a different data type instead, such as a string or boolean. This mismatch can cause the operation to fail. To resolve this issue, you should first identify the field or parameter causing the error. Then, ensure that the input provided is a number. If the input is being generated by a script or application, you may need to debug the code to ensure it’s producing the correct data type.

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This guide will help you check for common problems that cause the log ” expected number but found: ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .

Log Context

Log “expected number but found:” class name is GeoWKTParser.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :

 } catch (NumberFormatException e) {
 throw new OpenSearchParseException("invalid number found: " + stream.sval; stream.lineno());
 throw new OpenSearchParseException("expected number but found: " + tokenString(stream); stream.lineno());
 }  private static String tokenString(StreamTokenizer stream) {
 switch (stream.ttype) {
 case StreamTokenizer.TT_WORD:


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