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.
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();
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