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Briefly, this error occurs when you try to use an expression with a text variable in Elasticsearch. This is not allowed because text fields are not optimised for operations that require numerical or date-based calculations. To resolve this issue, you can either change the field type to a numerical or date type, or use a keyword field instead. Alternatively, you can use a script to convert the text field to a numerical or date type before performing the operation.
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This guide will help you check for common problems that cause the log ” Cannot use expression with text variable using ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “Cannot use expression with text variable using” class name is ExpressionAggregationScript.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
// _value isn't used in script if specialValue == null
if (specialValue != null) {
if (value instanceof Number) {
specialValue.setValue(((Number) value).doubleValue());
} else {
throw new GeneralScriptException("Cannot use expression with text variable using " + exprScript);
}
}
}
};
}
