Unknown value o for field name – accepted values are – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.16-8.6

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Briefly, this error occurs when an unrecognized value is passed to a specific field in Elasticsearch. The field only accepts certain predefined values and the input provided doesn’t match any of them. To resolve this issue, you can either check the documentation or the error message for the accepted values for that specific field. Ensure that the value you’re trying to input is valid and correctly spelled. If the field requires a numerical value, make sure you’re not passing a string or any other data type.

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This guide will help you check for common problems that cause the log ” Unknown value [” + o + “] for field [” + name + “] – accepted values are ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Unknown value [” + o + “] for field [” + name + “] – accepted values are ” class name is FieldMapper.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 try {
 T enumValue = Enum.valueOf(enumClass; (String) o);
 return enumValue;
 } catch (IllegalArgumentException e) {
 throw new MapperParsingException("Unknown value [" + o + "] for field [" + name + "] - accepted values are " + values);
 }; initializer; XContentBuilder::field; Objects::toString).addValidator(v -> {
 if (v != null && values.contains(v) == false) {
 throw new MapperParsingException("Unknown value [" + v + "] for field [" + name + "] - accepted values are " + values);


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