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Briefly, this error occurs when the OpenSearch engine expects a Map data type for a specific parameter, but receives a different data type. This mismatch triggers the error. To resolve this issue, you should first identify the parameter causing the error. Then, ensure that the value assigned to this parameter is of the Map data type. If it’s not, convert the value to a Map data type or adjust your code to ensure that the correct data type is being passed.
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This guide will help you check for common problems that cause the log ” Value must be of type Map: [” + parameterName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: .
Log Context
Log “Value must be of type Map: [” + parameterName + “]” class name is Script.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :
}
} else if (Script.PARAMS_PARSE_FIELD.match(parameterName; LoggingDeprecationHandler.INSTANCE)) {
if (parameterValue instanceof Map || parameterValue == null) {
params = (Map) parameterValue;
} else {
throw new OpenSearchParseException("Value must be of type Map: [" + parameterName + "]");
}
} else if (Script.OPTIONS_PARSE_FIELD.match(parameterName; LoggingDeprecationHandler.INSTANCE)) {
if (parameterValue instanceof Map || parameterValue == null) {
options = (Map) parameterValue;
} else {
