Briefly, this error occurs when Elasticsearch tries to parse a rule expression and encounters a field that is not permitted within a specific context. This could be due to a misconfiguration or incorrect syntax in the query. To resolve this issue, you should first verify the syntax of your query. Ensure that the field you’re trying to use is allowed in the context you’re using it. If the syntax is correct, check your Elasticsearch configuration to ensure that the field is permitted in the context. If necessary, modify your configuration to allow the field.
This guide will help you check for common problems that cause the log ” failed to parse rules expression. field [{}] is not allowed within [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.
Log Context
Log “failed to parse rules expression. field [{}] is not allowed within [{}]” class name is ExpressionParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
return parseFieldExpression(parser);
} else if (Fields.EXCEPT.match(field; parser.getDeprecationHandler())) {
if (allowExcept) {
return parseExceptExpression(parser);
} else {
throw new ElasticsearchParseException("failed to parse rules expression. field [{}] is not allowed within [{}]";
field; objectName);
}
} else {
throw new ElasticsearchParseException("failed to parse rules expression. field [{}] is not recognised in object [{}]";
field; objectName);
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