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Briefly, this error occurs when Elasticsearch encounters an incorrectly formatted regular expression file. It expects an ‘object’ type but is receiving something different. To resolve this issue, you can: 1) Review the regular expression file for any syntax errors or incorrect formatting. 2) Ensure that the file is correctly structured as an ‘object’. 3) Validate the regular expression file using a JSON validator to catch any potential errors. 4) Check the Elasticsearch version compatibility with the regular expression file, as different versions may have different requirements.
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This guide will help you check for common problems that cause the log ” malformed regular expression file; expecting ‘object’ ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “malformed regular expression file; expecting ‘object'” class name is UserAgentParser.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :
throw new ElasticsearchParseException("malformed regular expression file; should continue with 'array' after 'object'");
} token = yamlParser.nextToken();
if (token != XContentParser.Token.START_OBJECT) {
throw new ElasticsearchParseException("malformed regular expression file; expecting 'object'");
} while (token == XContentParser.Token.START_OBJECT) {
token = yamlParser.nextToken();
